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Certified Hemodialysis Technologist/Technician (CHT) Study Guide
Practise fluid-removal calculations, access assessment, machine checks, water safety and infection prevention for BONENT CHT with a free guide and original drills.
By CertMedbry · Updated 31 October 2026
Learn to calculate fluid-removal goals, distinguish access abnormalities, interpret treatment changes, verify equipment readiness and prevent cross-contamination. This guide follows BONENT's Certified Hemodialysis Technologist/Technician examination for the patient-care technician pathway. Its 60 concepts are selective: the official Examination Content Outline defines the full scope, including tasks not developed individually here. Apply procedures within your training, authorization and jurisdiction. The guide, questions and flashcards are independently authored educational materials.
Try 20 free practice questionsWhat is the exam format?
Check the question types, timing and outline before planning your revision.
How many questions are on the CHT examination, and how much time is allowed?
BONENT specifies 150 multiple-choice questions with a three-hour time limit. Its cited examination materials do not separately identify scored and unscored pretest counts.
How is the examination delivered, and is it adaptive?
BONENT offers Paper and Pencil Exam and Computer Based Testing methods. The February 2024 handbook describes the same examination content and time allowance for both, with an onsite proctor. It states that CBT candidates can skip questions, return to previous questions and change answers. These sources do not describe adaptive delivery.
BONENT Candidate Examination Handbook, revised February 2024
Which question styles are verified?
The issuer describes multiple-choice questions. Its cited examination materials do not establish additional item styles. The 20 questions here are original four-option, single-best-answer learning drills; they do not reproduce official items or predict examination results.
Certified Hemodialysis Technologist/Technician (CHT) · BONENT Candidate Examination Handbook, revised February 2024
Which blueprint and dates does this guide use?
The current issuer webpage and linked four-page CHT Examination Content Outline were verified on October 13, 2026, and corroborated again on October 30, 2026. The outline has no printed version or effective date. February 2024 is the handbook revision date, not a verified blueprint effective date. The webpage and standalone outline use Education and Professional Development; the handbook summary's Education/Personal Development wording refers to the same domain.
Certified Hemodialysis Technologist/Technician (CHT) · BONENT CHT Examination Content Outline · BONENT Candidate Examination Handbook, revised February 2024
How are the official domains represented here?
Official weights are Patient Care 45%, Machine Technology 12%, Water Treatment 15%, Infection Control 18%, and Education and Professional Development 10%. The 60 concepts use a 27/7/9/11/6 distribution. Questions and flashcards each use 9/2/3/4/2, an approximation at a 20-item scale. Use the complete official outline to identify remaining study needs.
Which credential pathway is covered, and what about other BONENT examinations?
This guide covers the Certified Hemodialysis Technologist/Technician patient-care pathway only. CHBT, CHWS, CHN and CPDN are separate certifications with different scopes and outlines. Paper and pencil and computer-based delivery are examination methods for CHT, not different professional credentials.
BONENT Candidate Examination Handbook, revised February 2024
Does CHT certification establish permission to perform every listed task?
No. BONENT identifies technical examination scope, while state requirements, other applicable laws, employer policies and demonstrated competency govern practice permissions. The outline includes tasks such as catheter care and heparin administration; their inclusion does not independently authorize a technician to perform them. Confirm current eligibility and application requirements with BONENT.
Certified Hemodialysis Technologist/Technician (CHT) · BONENT CHT Examination Content Outline
CHT assesses hemodialysis technologist/technician proficiency. BONENT's CHBT biomedical technician, CHWS water specialist, CHN hemodialysis nurse and CPDN peritoneal dialysis nurse examinations have separate outlines. Their requirements and domain weights do not apply to this guide.
Outline used: Current BONENT CHT examination webpage and its linked, undated four-page Examination Content Outline, verified on 2026-10-13 (Asia/Hong_Kong). Corroborated by the Candidate Examination Handbook revised February 2024. The linked outline states no version number or effective date; a 2026 syllabus effective date is not asserted. The workbook label matches the official credential name, and the assigned slug is preserved.
60 key concepts: understand, apply and avoid the traps
Work through the questions by exam domain. Explain the answer in your own words, try the example, then check the common pitfall.
Patient Care45%
1.How does diffusion remove dissolved wastes?
Diffusion moves dissolved substances across the dialyzer membrane down a concentration gradient. Blood and dialysate remain in separate compartments while selected solutes cross the membrane. Removal depends on the gradient, membrane characteristics and delivery of blood and dialysate. Distinguish solute clearance from fluid removal: a treatment can remove water without delivering the intended waste clearance. Compare delivered treatment time and flows with the prescription when evaluating effectiveness.
Apply it
A patient reaches the planned postdialysis weight after a substantially shortened session and assumes treatment was complete. Explain that reaching a fluid target does not establish adequate waste removal, and report the shortened treatment to the nurse.
Common pitfall: Equating kilograms lost with dialysis adequacy overlooks diffusion. A satisfactory weight change cannot show that the prescribed solute-removal treatment was delivered.
Hemodialysis — NIDDK · Hemodialysis — National Kidney Foundation
2.What distinguishes ultrafiltration from diffusion?
Ultrafiltration removes water across the dialyzer membrane through a pressure-driven process. Diffusion primarily describes solute movement down concentration gradients. These processes occur together during conventional hemodialysis but answer different clinical questions: how much fluid is being removed and how effectively dissolved wastes are being cleared. Evaluate the ultrafiltration plan against weight, symptoms and treatment time rather than assuming a blood-flow setting directly specifies fluid removal.
Apply it
A learner proposes increasing the blood-pump speed to correct an excessive fluid-removal goal. Identify the separate prescribed variables: blood flow affects delivery through the dialyzer, while the ultrafiltration goal and available time determine planned fluid removal.
Common pitfall: Treating blood flow and ultrafiltration rate as interchangeable settings can obscure the actual source of a fluid-management error and delay correction.
Hemodialysis — National Kidney Foundation · Hemodialysis — NIDDK
3.Why must target dry weight be reassessed?
Dry weight estimates weight without excess fluid; it is not a permanently fixed measurement. Changes in nutrition, illness or body tissue can alter the appropriate target. Repeated cramps, dizziness or low blood pressure near a target may indicate excessive removal, while persistent swelling or breathlessness may suggest remaining fluid excess. These findings require clinical assessment rather than automatic target changes. Report patterns across treatments so the nurse and prescriber can reassess the plan.
Apply it
A patient has lost appetite and body mass over several weeks but still finishes at the old target weight with ankle swelling. Report the weight trend and symptoms for reassessment instead of treating the recorded target as conclusive.
Common pitfall: Assuming every symptom proves an incorrect dry weight ignores other causes. Symptoms guide reassessment; they do not independently authorize a new target.
4.How should an unexpected predialysis weight be checked?
Predialysis weight informs fluid-removal planning, so an implausible measurement should be verified before it drives treatment settings. Check patient identity, units, scale readiness and differences such as clothing or carried objects. Compare the result with recent postdialysis weight and the patient's reported intake and symptoms. A confirmed gain remains clinically meaningful, but a measurement error should not become an excessive removal goal. Discuss discrepancies with the nurse before proceeding.
Apply it
A patient's recorded gain is unexpectedly large, but the patient was weighed holding a heavy bag. Repeat the measurement under comparable conditions, correct the documented measurement appropriately and use the verified result when discussing the fluid plan.
Common pitfall: Automatically subtracting an estimated bag weight substitutes another uncertain number. Repeat a questionable measurement rather than making an unsupported correction to the treatment goal.
BONENT CHT Examination Content Outline · What Is Dry Weight?
5.How is a hypothetical fluid-removal goal calculated?
For a simplified calculation, subtract prescribed target weight from verified predialysis weight and approximate each kilogram of fluid difference as one liter. Add fluid expected to enter the patient during treatment if that fluid is not already included in the facility's goal convention. State every assumption, including saline and oral intake. The calculated amount is a proposed accounting result; the nurse must reconcile it with the prescription, current assessment and treatment tolerance.
Apply it
Predialysis weight is 74.2 kg, target weight is 72.0 kg, and 0.3 L will enter the patient. Assuming no other gains or losses and no prior allowance, the proposed machine removal is 2.5 L.
Common pitfall: Adding saline twice inflates removal. Determine whether the displayed goal already includes anticipated fluid before applying an additional allowance to the calculation.
Hemodialysis — National Kidney Foundation · BONENT CHT Examination Content Outline
6.How does treatment time change ultrafiltration rate?
Average ultrafiltration rate equals the planned removal volume divided by available treatment time. A weight-normalized rate further divides milliliters per hour by the stated patient weight in kilograms. Shortening treatment while keeping removal unchanged raises the required average rate. This arithmetic explains why late starts and interruptions matter, but it does not establish a universally safe rate. Report the changed time and proposed rate for clinical review rather than compressing the prescription automatically.
Apply it
A hypothetical 2,400 mL goal over four hours averages 600 mL/hour. With a stated weight of 60 kg, that equals 10 mL/kg/hour. Delivering the same removal over three hours raises the average to 800 mL/hour.
Common pitfall: A correctly calculated rate is not proof of patient tolerance. Symptoms, cardiovascular status and the prescribed treatment plan still determine whether adjustment is appropriate.
What Is Dry Weight? · BONENT CHT Examination Content Outline
7.What makes sequential ultrafiltration a separate treatment phase?
Sequential ultrafiltration separates a fluid-removal phase from the usual combined fluid-removal and diffusive dialysis phase. The distinction matters because time used for isolated fluid removal should not automatically be counted as equivalent diffusive clearance time. Follow the prescribed sequence and document the phases actually delivered. A technician should recognize the ordered plan and discuss discrepancies with the nurse rather than independently substituting isolated ultrafiltration for prescribed dialysis time.
Apply it
An order specifies a distinct ultrafiltration phase followed by hemodialysis. A scheduling change would shorten the hemodialysis portion. Identify the loss of prescribed clearance time and obtain review before treating the two phases as interchangeable.
Common pitfall: Counting all machine-connected time as identical dialysis delivery overlooks the different purpose of an isolated fluid-removal phase and can conceal reduced prescribed clearance.
BONENT CHT Examination Content Outline · Hemodialysis — National Kidney Foundation
8.Which findings establish a useful pretreatment baseline?
A useful baseline combines weight, vital signs, symptoms, edema and access observations with the patient's usual pattern. A single blood-pressure value does not describe fluid status or treatment readiness. Ask about new complaints and report meaningful changes before initiating treatment. Baseline observations make later changes interpretable: dizziness accompanied by a substantial pressure decline has a different significance from a stable measurement typical for that patient. Record actual findings rather than a generic statement.
Apply it
A patient's pressure resembles the usual value, but new breathlessness and lower-leg swelling are present. Report the combined findings before treatment planning instead of concluding that a familiar pressure proves usual fluid status and routine readiness.
Common pitfall: Using one acceptable vital sign to dismiss new symptoms loses the clinical pattern. Compare multiple observations and the patient's own account with baseline.
Hemodialysis — NIDDK · BONENT CHT Examination Content Outline
9.How should symptomatic blood-pressure decline be interpreted and managed during hemodialysis?
Ultrafiltration can remove circulating fluid faster than fluid moves from tissues back into the bloodstream, reducing venous return and blood pressure. Dizziness, nausea, weakness or cramping with a pressure decline requires immediate assessment. Notify the nurse and, within the authorized emergency procedure, stop ultrafiltration, place the patient supine with legs elevated if tolerated, and administer prescribed or protocol-authorized isotonic saline when indicated. These measures limit further volume loss and support circulating volume. Repeatedly assess blood pressure, pulse, consciousness and symptoms to determine whether stability is returning. Persistent hypotension requires urgent clinical evaluation for additional causes, including infection, arrhythmia or a dialysis reaction. Emergency actions under an established protocol do not authorize independently changing target weight, dialysate composition or the ongoing prescription.
Apply it
During ultrafiltration, a patient's pressure falls from 132/76 to 86/50 mm Hg with nausea and lightheadedness. Obtain nursing assistance immediately, stop ultrafiltration under the authorized procedure, position the patient appropriately and provide authorized saline if indicated. Recheck pressure and symptoms after intervention. Continued instability, especially with fever, an irregular pulse or new respiratory symptoms, requires urgent evaluation beyond excessive fluid removal. Document measurements, actions, fluid administered and the patient's response.
Common pitfall: Treating every pressure decline as proof that target weight is too low can miss another serious illness. Failure to improve after stopping ultrafiltration and supporting circulation is a decisive reason to broaden assessment. Do not restart fluid removal merely to achieve the original fluid goal while the patient remains unstable.
Hemodialysis — NIDDK · What Is Dry Weight? · FINAL-HD-Guideline.pdf
10.Why can cramps signal a fluid-removal problem?
Muscle cramps during hemodialysis can accompany rapid fluid removal or removal beyond the patient's current tolerance. Their timing relative to ultrafiltration, pressure changes and proximity to target weight helps interpretation. Report cramps and reassess the patient with the nurse rather than treating discomfort as an expected inconvenience. Recurrent episodes should inform review of the fluid plan. Cramps are a warning cue, not a specific diagnosis or permission to independently alter the prescription.
Apply it
A patient develops painful leg cramps near the end of several treatments despite reaching the recorded target. Document timing, pressure and removal data, report the recurring pattern and request review of treatment tolerance and target weight.
Common pitfall: Focusing only on relieving the muscle pain can leave the contributing fluid-removal pattern unexamined. Repeated symptoms deserve review beyond the individual episode.
11.When does postdialysis dizziness require reassessment?
Dizziness on sitting or standing after dialysis may reflect orthostatic intolerance following fluid removal. A satisfactory seated measurement does not establish that a patient can stand or leave safely. Assist the patient, prevent a fall, notify the nurse and obtain the assessment required by the unit's procedure. Compare symptoms and position-related measurements with pretreatment status. Document the response before discharge rather than treating completion of the machine cycle as completion of patient evaluation.
Apply it
A patient feels well while seated but becomes dizzy when rising to leave. Help the patient return to a safe position, obtain nursing assessment and reassess readiness for departure instead of proceeding because the scheduled treatment has ended.
Common pitfall: Relying on the last seated pressure overlooks a position-related change. Functional symptoms during standing remain relevant even after an apparently satisfactory treatment completion.
BONENT CHT Examination Content Outline · What Is Dry Weight?
12.Why does new breathlessness need prompt assessment?
Excess fluid can contribute to breathing difficulty, but breathlessness also has other potentially serious causes. Interpret it with onset, weight trend, edema, vital signs and associated complaints. New or worsening symptoms require prompt nursing assessment rather than an automatic increase in ultrafiltration. Support emergency assessment and oxygen delivery only as authorized by orders or emergency procedures. The essential distinction is between recognizing a possible fluid-related clue and independently diagnosing or prescribing its treatment.
Apply it
Before connection, a patient reports new shortness of breath and weighs above target. Alert the nurse and obtain immediate assessment; do not assume that beginning routine dialysis with extra removal is an adequate response to the new symptom.
Common pitfall: Weight above target makes fluid overload plausible but does not exclude other emergencies. Avoid using a familiar explanation to bypass assessment of acute breathlessness.
13.Which identifiers safely match a patient to treatment?
Use at least two person-specific identifiers to match the patient with the intended treatment and associated records. Suitable examples include name and date of birth under the organization's identification procedure. Chair number, room number and treatment location are not patient identifiers. Familiarity with a regular patient does not replace verification. Perform the match before initiating dialysis, and resolve discrepancies before connecting the patient or using a patient-specific item such as a labeled reused dialyzer.
Apply it
Two patients with similar names exchange their usual chairs. Verify each person's name and date of birth against the treatment record before connection, rather than using the familiar chair assignment to identify the intended prescription.
Common pitfall: Combining a patient's name with a chair number provides only one person-specific identifier. A location can change and cannot establish who the patient is.
14.How should treatment settings be matched to the prescription?
Compare the current patient-specific order with treatment duration, dialysate prescription, blood flow, dialysate flow and fluid-removal plan before initiation. A saved machine program or yesterday's record may not reflect a changed order. Resolve mismatches with the nurse before starting rather than choosing whichever setting seems customary. The technical task is accurate implementation and recognition of discrepancies; selecting a new bath or changing treatment duration requires the appropriate clinical authority.
Apply it
A saved setup displays a different dialysate prescription from the current signed order. Hold initiation while the discrepancy is resolved with the nurse, then verify the corrected setup against the current patient-specific prescription before connection.
Common pitfall: A familiar setup can feel more trustworthy than a recent change. Habit does not supersede the current verified order or justify an independent prescription choice.
15.What distinguishes fistulas, grafts and dialysis catheters?
An arteriovenous fistula connects a native artery and vein; a graft uses a conduit between them. Both provide access for dialysis needles once suitable for use. A dialysis catheter is a tube placed into a large vein and connects through external lumens. Access type determines assessment and connection precautions. Catheters have greater infection risk than fistulas. Recognize the structure and current access plan rather than assuming every visible access can be cannulated or used identically.
Apply it
A new patient has an arm graft and a chest catheter. Confirm which access is currently authorized for treatment and assess it accordingly, rather than choosing the arm access solely because it appears to be a permanent access.
Common pitfall: The presence of a surgically created access does not prove readiness for cannulation. Access type, suitability and the current treatment plan all matter.
Hemodialysis Access — National Kidney Foundation · Hemodialysis — NIDDK
16.When does a changed access thrill require action?
A thrill is the vibration produced by blood flowing through an arteriovenous access. Patients and staff should recognize the access's usual finding. A stopped or distinctly changed thrill can indicate an access problem and warrants immediate reporting to the dialysis team. Do not assume that a healed appearance proves patency or that routine cannulation will resolve the change. Assess and escalate before use so the appropriate clinician can determine the next step.
Apply it
A patient reports that the usual buzzing sensation disappeared that morning. Confirm and report the change immediately, and obtain assessment before cannulation rather than proceeding because the skin appears healed and the patient has no fever.
Common pitfall: Absence of pain or redness does not establish blood flow. A patency concern remains significant even when the access has no obvious infection signs.
17.Which access findings suggest infection?
Redness, warmth, swelling, drainage or new tenderness around an access can indicate infection. Fever or chills add concern for systemic involvement. Inspect the access before use and report new findings promptly; a patent access can still be infected. Distinguish flow assessment from infection assessment because a present thrill answers only part of the readiness question. Record objective observations and the patient's symptoms without substituting a technician's unconfirmed diagnosis for clinical evaluation.
Apply it
A graft has its usual thrill, but the overlying skin is newly red and tender with drainage. Report these findings before use and obtain nursing assessment instead of considering the normal thrill sufficient evidence that treatment can begin routinely.
Common pitfall: A functioning access is not necessarily a healthy access. Patency does not exclude local infection or remove the need to investigate new inflammatory findings.
Hemodialysis — NIDDK · Hemodialysis Access — National Kidney Foundation
18.How should an access arm be protected?
Protect an arteriovenous access from avoidable compression and injury. Routine blood-pressure measurement and unrelated blood draws should use an appropriate alternative rather than the access arm. Teach patients to avoid restrictive pressure and to check their access as instructed. Protection continues between treatments and should be communicated when the patient receives care elsewhere. A visible access label can support communication, but staff still need to identify the access and choose procedures deliberately.
Apply it
A visiting staff member prepares to take a routine pressure on the fistula arm. Identify the access and redirect the measurement to an appropriate alternative, explaining that unnecessary compression of the access arm should be avoided.
Common pitfall: Assuming that a mature fistula no longer needs protection invites preventable injury. Maturity supports use for dialysis, not unrestricted compression or unrelated venipuncture.
19.What must be verified before using a reused dialyzer?
Verify patient-specific ownership, inspect the dialyzer and confirm documented reprocessing acceptance. Performance testing, such as blood-compartment volume assessment, evaluates whether sufficient usable fibers remain; a membrane-integrity or pressure-leak test evaluates whether the blood and dialysate compartments remain separated. For chemical reprocessing, verify the prescribed germicide concentration and completed exposure conditions, including contact time, before rinsing. After rinsing, test for residual germicide and confirm an acceptable result before connection. CMS reuse requirements and the applicable dialyzer, reprocessing-system and germicide instructions govern the methods and acceptance criteria. These checks establish identity, retained function, integrity, disinfection and chemical readiness separately.
Apply it
A reused dialyzer matches the patient's identifiers and has acceptable performance and integrity results, but the documented germicide exposure is incomplete. Withhold it from use: ownership and mechanical testing cannot establish adequate disinfection. Even after adequate exposure is confirmed, rinsing and an acceptable residual-germicide result are still required before connection.
Common pitfall: A correct label cannot establish successful reprocessing. An acceptable residual test shows that rinsing reduced germicide to the permitted level; it does not prove that adequate germicide exposure occurred beforehand.
BONENT CHT Examination Content Outline · CMS State Operations Manual, Appendix H — ESRD Facilities · Two Patient Identifiers — Understanding the Requirements
20.Why must catheter dressings and connections remain protected?
A dialysis catheter provides a direct route into the bloodstream, making its external connections and insertion-site protection important. Check for an intact dressing and report loosening, dampness, drainage or other abnormalities. Catheter access and dressing procedures require the authorized aseptic technique; unnecessary handling creates additional opportunities for contamination. Keep the catheter secured against traction. Recognize a compromised dressing as a finding requiring attention rather than covering it with an improvised layer and continuing routinely.
Apply it
At arrival, a patient's catheter dressing is loose and damp. Report the finding and arrange authorized catheter-site assessment and dressing care before routine use, while avoiding unnecessary manipulation of the catheter connections or exposed site.
Common pitfall: An apparently clean outer surface does not establish that a loose dressing still protects the insertion site. Address dressing integrity rather than appearance alone.
Hemodialysis — NIDDK · Best Practices for Bloodstream Infection Prevention in Dialysis Setting
21.How can reduced blood flow affect treatment delivery?
Blood flow delivers blood to the dialyzer for solute exchange. Persistent delivery below the prescribed rate can reduce treatment effectiveness, particularly when combined with shortened time or access problems. Compare actual flows and interruptions with the prescription and record meaningful deviations. The displayed pump setting alone does not prove that the full intended treatment was delivered. Report the cause and duration of reduced flow so the nurse can evaluate the treatment and access.
Apply it
Repeated access-related interruptions keep blood flow below the prescribed setting for much of a session. Record the actual delivery problem and alert the nurse rather than documenting only the original prescribed flow as though it remained continuously achieved.
Common pitfall: Focusing on the final displayed setting can hide prolonged underdelivery earlier in treatment. Duration of deviations and interruptions matters alongside the setting itself.
Hemodialysis — NIDDK · BONENT CHT Examination Content Outline
22.How is urea reduction ratio calculated, and how can sampling errors distort it?
Urea reduction ratio is calculated as [(predialysis BUN − postdialysis BUN) ÷ predialysis BUN] × 100. Both samples must represent the same treatment. Access recirculation returns some recently dialyzed, low-urea blood to the dialyzer inlet. Sampling this blood without the required sampling procedure can produce an artificially low postdialysis BUN and falsely elevated URR, overstating delivered dialysis. The 2006 KDOQI slow-flow method reduces blood flow to 100 mL/min, usually for 15 seconds before sampling, allowing unrecirculated blood to reach the sampling site. Apply the validated procedure appropriate to the tubing and access. Obtain the predialysis sample before treatment begins and avoid saline or heparin dilution; an artificially low predialysis BUN can falsely lower URR.
Apply it
Properly collected BUN values of 60 mg/dL before treatment and 18 mg/dL afterward yield a URR of 70%. If access recirculation instead causes the postdialysis sample to read 12 mg/dL, the apparent URR becomes 80%. That higher percentage reflects sampling bias rather than better systemic urea removal. An immediate sample drawn at full treatment blood flow in a patient with recirculation is therefore a recognizable concern. Report the collection deviation so the team can assess the result's validity.
Common pitfall: Accurate arithmetic cannot correct a biased specimen. Postdialysis contamination by recirculated low-urea blood raises the apparent URR, whereas predialysis saline dilution lowers it when the postdialysis value is unchanged. URR measures reduction in a small-solute marker; it does not independently establish satisfactory fluid status, access health or overall dialysis adequacy.
Hemodialysis — National Kidney Foundation · BONENT CHT Examination Content Outline · NKF KDOQI Guidelines
23.Why must anticoagulation follow the current order?
Anticoagulation helps limit clotting in the extracorporeal circuit, but the treatment must be balanced against bleeding risk. The CHT outline includes initiation heparin and dialysis-clinic medications; it does not authorize independent medication selection or dose adjustment. Verify the current order and required checks before any authorized administration. Report unusual bleeding, visible circuit clotting or a discrepancy in the medication plan so the nurse can evaluate the patient and prescription together.
Apply it
A patient reports a recent bleeding episode, while the usual anticoagulation order remains on the treatment record. Notify the nurse before authorized administration and verify the current plan instead of assuming that the customary regimen remains appropriate.
Common pitfall: Visible clotting does not authorize an extra anticoagulant dose. Medication changes require the proper order and assessment of both circuit findings and bleeding risk.
BONENT CHT Examination Content Outline · Hemodialysis — National Kidney Foundation
24.What can circuit inspection reveal during and after treatment?
Inspection of the dialyzer and blood circuit can reveal visible clotting, leaks or other abnormalities that require reporting. The official outline includes checking dialyzer efficiency through observations such as clots, fibers and leaks after treatment. Interpret these findings alongside delivered flows, interruptions and the prescribed anticoagulation plan. Appearance alone does not quantify clearance, but it can identify a treatment-delivery concern. Document the actual observation instead of recording a nonspecific statement that the dialyzer looked poor.
Apply it
After treatment, the dialyzer has visibly clotted areas and the session included repeated flow interruptions. Record both findings and inform the nurse so treatment delivery and the circuit problem can be reviewed together rather than as unrelated events.
Common pitfall: A visually clear dialyzer does not prove adequate treatment, just as visible clotting does not quantify the exact clearance lost. Combine observations with delivery data.
BONENT CHT Examination Content Outline · Hemodialysis — National Kidney Foundation
25.Why should the access and blood connections remain visible?
Visible access sites and blood connections support direct recognition of bleeding, displacement and connection problems. Machine monitoring complements observation but does not replace assessment of the patient and extracorporeal circuit. Keep the access appropriately secured and observable under the unit's procedure, and respond immediately to blood outside the circuit or a displaced needle. Do not assume that silence from the machine establishes connection safety. Report and document the event and the response.
Apply it
A patient's blanket covers the needle sites and blood connections. Explain the need for observation and reposition it so the access remains appropriately visible, while maintaining warmth and privacy and checking that the lines are secured without traction.
Common pitfall: Treating the absence of an alarm as proof that no bleeding is occurring replaces direct observation with an incomplete safety signal during extracorporeal treatment.
Hemodialysis — NIDDK · BONENT CHT Examination Content Outline
26.How is needle-site bleeding controlled without sacrificing access flow?
After needle removal, apply direct pressure sufficient to control bleeding while avoiding unnecessary compression that stops access flow. Reassess the site and access according to the unit's procedure, and report unusually prolonged or recurrent bleeding. A dressing should protect a site after hemostasis rather than conceal continuing blood loss. The important balance is effective local bleeding control with preservation of access patency. Severe or uncontrolled bleeding requires immediate emergency assistance and the facility's response procedure.
Apply it
A needle site continues oozing after the initial period of pressure. Maintain appropriate direct pressure, obtain nursing assessment and reassess bleeding rather than applying a dressing and sending the patient away while the site remains active.
Common pitfall: More compression is not automatically better. Excessive pressure may compromise access flow, while insufficient pressure or premature release may allow bleeding to continue.
KDOQI Clinical Practice Guideline for Vascular Access: 2019 Update · Hemodialysis Access — National Kidney Foundation
27.What makes posttreatment documentation clinically useful?
Useful documentation connects the prescribed plan with what actually occurred: treatment time, relevant measurements, fluid removal, symptoms, access findings, interventions and patient response. Record deviations and whom you notified rather than implying that planned care was delivered unchanged. Posttreatment weight and vital signs help evaluate the outcome but do not erase events during the session. Timely factual entries support continuity of care, particularly when another team member must reassess recurrent symptoms or incomplete treatment.
Apply it
A treatment ends early after dizziness and nursing intervention. Document the actual stop time, relevant measurements, intervention and response, then the posttreatment findings, rather than entering the scheduled duration simply because it was the original prescription.
Common pitfall: Copying the planned treatment into the completion record conceals underdelivery and clinical events. Document observed care and outcomes, including unresolved concerns and handoff information.
BONENT CHT Examination Content Outline · CMS State Operations Manual, Appendix H — ESRD Facilities
Machine Technology12%
28.Why must the extracorporeal circuit be primed correctly?
Priming prepares the dialyzer and blood tubing for treatment according to the equipment instructions. It fills the circuit and supports removal of air before patient connection. Correct assembly, inspection and completion of required preparation steps are separate from entering treatment settings. An apparently ready display does not establish that the blood pathway has been prepared correctly. Use the specified procedure and resolve visible air, connection defects or incomplete preparation before initiating extracorporeal blood flow.
Apply it
The prescribed settings are entered, but inspection reveals a circuit section that has not been adequately primed. Complete the manufacturer's preparation and required checks before connection instead of using the completed settings screen as the sole readiness indicator.
Common pitfall: Setup completion on a display does not confirm correct physical preparation. Inspect the circuit and follow required priming steps rather than relying on software status alone.
BONENT CHT Examination Content Outline · 2008T Quick Start Guide, revision D
29.When is residual-disinfectant testing required before use?
After chemical disinfection and rinsing, verify that residual disinfectant meets the equipment's release requirements before patient treatment. A completed rinse cycle is not equivalent to a documented acceptable residual test. Use the correct test method for the chemical and follow the manufacturer's sampling instructions. If the result is unacceptable or uncertain, keep the equipment out of patient use and complete the prescribed corrective process. Record the result and release checks rather than assuming time alone removed the chemical.
Apply it
A machine has finished rinsing after chemical disinfection, but its residual test remains positive. Continue the approved corrective rinsing and retesting process and withhold patient use until all release criteria are met and the result is documented.
Common pitfall: Conductivity and pH verification do not replace a chemical-specific residual test. Different checks address different hazards, even when all are part of pretreatment preparation.
30.Why are conductivity and pH separate dialysate checks?
Conductivity reflects the electrical conductance of dissolved ions, while pH describes acidity or alkalinity. They test different properties of prepared dialysate. An acceptable conductivity reading cannot establish that pH is acceptable or that the intended concentrate was selected. Follow the specific machine instructions for independent verification and acceptance limits. A failed check requires investigation before treatment. Numerical ranges in one manufacturer's guide should not be generalized to every dialysis machine or prescription.
Apply it
A unit's stated procedure requires acceptable results for both tests. Conductivity passes, but pH falls outside the stated acceptance range. Keep the machine out of use and investigate rather than accepting one successful measurement as sufficient clearance.
Common pitfall: A normal conductivity value can create false reassurance. Confirm each required property independently and verify concentrate identity rather than inferring overall dialysate suitability from one number.
31.How should acid and bicarbonate concentrates be verified?
Verify that acid and bicarbonate concentrates match the intended machine system and prescribed dialysate preparation. Check labels, connections and the required preparation information before use. Similar containers or familiar positions do not establish compatibility or correct formulation. Required dialysate testing supplements this identity check; it does not replace it. Resolve unclear labeling or a mismatch before treatment, and document preparation according to the equipment and facility procedures rather than improvising a substitute.
Apply it
Two similar concentrate containers are available, but one has an unclear label. Select only a verified compatible product after resolving its identity; do not connect the uncertain container merely because its location matches the usual setup.
Common pitfall: Matching a container's appearance or connector is not enough. Verify the labeled concentrate and prescribed preparation rather than assuming physical compatibility establishes the correct dialysate.
BONENT CHT Examination Content Outline · 2008T Quick Start Guide, revision D
32.Why does dialysate temperature require its own safety check even when conductivity is acceptable?
Conductivity assesses an electrical property related to dialysate ions; an acceptable result does not exclude dangerous overheating. Heat can transfer across the dialyzer membrane to circulating blood. Severe dialysate overheating can damage red cells and cause acute hemolysis, releasing intracellular contents, including potassium, into plasma. Warning cues include chest or back pain, dyspnea and abnormal circuit-blood appearance. Verify the prescribed temperature and required temperature-monitoring and alarm checks independently of conductivity, pH and residual-disinfectant testing. Use the specific manufacturer's acceptance limits and procedures. A temperature fault during preparation requires withholding patient use until resolved. Suspected hemolysis during treatment requires immediate emergency action rather than routine troubleshooting while blood continues circulating.
Apply it
During preparation, acceptable conductivity accompanies a persistent high-temperature alarm. Keep the machine out of patient use and obtain technical evaluation. If a patient already receiving treatment develops chest or back pain, dyspnea and unusual translucent cherry-red circuit blood, suspect acute hemolysis. Initiate the authorized emergency procedure: stop the blood pump, clamp the bloodlines, summon immediate clinical assistance and do not return the circuit blood to the patient. Returning hemolyzed blood can worsen the potassium load.
Common pitfall: A passing conductivity result cannot clear a failed temperature safeguard. Conversely, abnormal blood appearance alone does not establish overheating as the cause, because hemolysis has other causes. Protect the patient immediately, then support investigation of temperature, dialysate and circuit factors. Never bypass the temperature alarm or resume treatment solely because conductivity remains acceptable.
BONENT CHT Examination Content Outline · Operator’s Manuals — Hemodialysis · Management%2Bof%2BComplications%2Bduring%2BHaemodialysis%2BCG%2BV1.pdf
33.How should safety alarms be tested and investigated?
Air detectors monitor air in the blood pathway; blood-leak detectors monitor the dialysate effluent for evidence of blood crossing a damaged membrane. Arterial and venous pressure monitors detect departures from their set limits. High venous pressure can accompany return-line obstruction, such as a kink or clot; unexpectedly low pressure can accompany a leak, loose connection, disconnection or needle displacement. Complete required pretreatment tests. During an alarm, assess the patient, identify whether pressure is high or low and inspect the exposed access and circuit before resetting. Restart only after resolving the cause, then verify acceptable pressure and alarm limits: some machines recenter limits around the pressure present at restart.
Apply it
A low venous-pressure alarm occurs after patient movement. Check the patient's condition, uncover and inspect needle sites, and trace connections and tubing for displacement or blood loss. Do not repeatedly restart to clear the alarm. After correction and authorized restart, confirm that pressure has returned to an acceptable value and that alarm limits have not recentered around an unresolved low pressure.
Common pitfall: Frequent high-pressure alarms can lead staff to misread a low-pressure event. Resetting can create false reassurance if new limits encompass the abnormal pressure; some disconnections also cause too little pressure change to trigger an alarm.
BONENT CHT Examination Content Outline · Operator’s Manuals — Hemodialysis · Haemodialysis and haemofiltration machines: Actions to take following pressure-related alarms to avoid unintentional alteration of alarm limits DSI/2022/004 - GOV.UK
34.What establishes equipment readiness beyond daily setup?
Equipment readiness includes required cleaning and disinfection records, scheduled maintenance, ancillary-device calibration checks and availability of emergency equipment. A successful startup does not establish that overdue maintenance or an unresolved fault has been addressed. Review the applicable records and report gaps before use. Calibration status matters because an inaccurate scale, pressure device or test meter can undermine subsequent treatment decisions. Record completed checks accurately so another staff member can verify readiness.
Apply it
A conductivity meter gives a plausible value, but its required calibration status cannot be established. Resolve the verification gap and use an appropriately verified device rather than accepting a believable number as proof of measurement reliability.
Common pitfall: Plausible readings can come from unverified equipment. Readiness depends on documented checks and maintenance status, not simply on whether a device powers on successfully.
Water Treatment15%
35.How does reverse osmosis purify dialysis water?
Reverse osmosis uses pressure to drive water across a semipermeable membrane while rejecting many dissolved contaminants into a separate stream. It is a purification step, not a substitute for every pretreatment component or microbial-control measure. Assess its performance using the system's specified checks and trends. A functioning pump alone does not prove adequate purification. Understand the distinction between feed water, purified product water and rejected water so sampling and interpretation address the correct stream.
Apply it
An operator points to a running RO pump as proof that water quality is satisfactory. Review the designated performance measurements and relevant quality results, identifying the product-water stream rather than relying on sound or motor operation alone.
Common pitfall: RO performance does not eliminate the need for carbon monitoring, disinfection or water-quality surveillance. Different system components and tests control different classes of hazards.
Water Purification and Softening Systems Used in Conjunction with Home Dialysis, NCD 230.7 · CMS State Operations Manual, Appendix H — ESRD Facilities
36.Why is activated carbon monitored for chlorine breakthrough?
Activated carbon removes chlorine-related disinfectants through adsorption and associated surface processes. Its protective capacity can be exhausted, so installation alone does not establish continued removal. Test at designated locations using the required method to detect breakthrough. Chlorine and chloramine exposure is hazardous in dialysis, making these checks distinct from RO conductivity or microbial testing. Interpret results against the applicable regulatory and facility limits, and act on an abnormal value before relying on downstream treatment.
Apply it
Product-water conductivity is stable, but a required post-carbon total-chlorine test is abnormal. Treat the chlorine result as an independent safety concern and follow the breakthrough procedure instead of assuming stable RO readings establish chemical safety.
Common pitfall: A carbon tank's age or appearance cannot verify remaining protective capacity. Required water testing provides evidence that visual inspection and a normal RO display cannot.
Water Purification and Softening Systems Used in Conjunction with Home Dialysis, NCD 230.7 · CMS State Operations Manual, Appendix H — ESRD Facilities
37.What does a water softener remove?
A water softener exchanges hardness-producing calcium and magnesium ions, helping reduce scale formation in downstream equipment. This function differs from carbon removal of chlorine-related disinfectants and RO purification. Verify softener performance using the specified hardness check and maintenance process. A satisfactory softener result cannot establish total dialysis-water suitability. Component recognition is useful because the correct response to an abnormal measurement depends on which treatment function has failed and what equipment lies downstream.
Apply it
A post-softener hardness check is unacceptable while post-carbon chlorine testing remains satisfactory. Identify a softening-performance problem and report it for the prescribed response rather than proposing carbon replacement as the direct correction for the hardness result.
Common pitfall: Calling all pretreatment devices filters obscures their different jobs. Softening does not replace carbon adsorption, reverse osmosis or microbial surveillance of the water system.
Water Purification and Softening Systems Used in Conjunction with Home Dialysis, NCD 230.7
38.Why do serial carbon components require distinct sampling points?
Sampling after the first carbon component evaluates its performance, while testing after the backup component evaluates whether the second barrier is still protecting the treated stream. These locations answer different questions and must be identified correctly. A result without a verified location can misdirect the response. Under U.S. requirements, a first-component breakthrough triggers testing of the second component. Do not confuse evidence that the backup remains effective with evidence that the first component is still functioning.
Apply it
A first-component sample is abnormal, but a second-component sample is acceptable. Report both results with their exact locations and follow the prescribed breakthrough response; the acceptable downstream result does not erase the upstream performance failure.
Common pitfall: Recording only a generic carbon result loses the distinction between detection of breakthrough and confirmation of the backup barrier. Sample location is essential clinical information.
39.When does U.S. total-chlorine testing trigger a second-component test?
Under 42 CFR 494.40(b)(2)(i), total chlorine equal to or greater than 0.1 mg/L after the first chlorine-removal component triggers testing after the second component. The separate provision in 494.40(b)(2)(ii) addresses results greater than the specified parameters after the last component: immediately correct the levels and confirm compliance by testing, or terminate dialysis treatment to prevent exposure. Corrective work may proceed during ongoing dialysis only with a holding tank of sufficient capacity whose water has been tested and meets the applicable requirements. Immediately notify the medical director and take corrective action to ensure ongoing compliance. A facility may adopt a stricter action threshold, but it must identify that as facility policy.
Apply it
Exactly 0.10 mg/L total chlorine after the first component requires the second-component test. If a verified result after the last component is 0.12 mg/L, activate immediate correction and confirmation or treatment termination, notify the medical director immediately and address ongoing compliance. Do not continue treatments during corrective work unless the tested holding-tank exception is satisfied.
Common pitfall: The first-component testing trigger says equal to or greater than; the last-component corrective-action provision says greater than the specified parameters. Preserve that distinction while following any stricter facility threshold.
Federal Register :: Request Access · CMS State Operations Manual, Appendix H — ESRD Facilities
40.How can water-test technique invalidate a reassuring result?
Water testing is meaningful only when the sample location, collection procedure, test method and timing match the required procedure. Verify reagent or strip suitability, expiration and the specified reading interval. Record actual results rather than substituting a general pass entry when a measured value is required. An uncertain test should be resolved with a valid measurement, not averaged with earlier acceptable results. Accurate testing connects the system's physical condition to a defensible decision about continued use.
Apply it
A total-chlorine strip was read after the manufacturer's specified interval and appears acceptable. Repeat the test correctly using the designated sample point and valid materials before relying on the result to support a water-safety decision.
Common pitfall: A reassuring color does not rescue incorrect technique. An invalid result creates uncertainty, even when earlier samples were acceptable and the system appears unchanged.
41.Why must ultraviolet exposure be monitored?
Effective bacterial-control ultraviolet treatment depends on adequate germicidal exposure, so lamp illumination alone does not establish performance. Monitor UV intensity and maintain the unit as specified. Killing bacteria can increase endotoxin concentrations; UV bacterial control therefore requires downstream endotoxin reduction. CMS Appendix H, V215, identifies an ultrafilter downstream of UV in purified-water distribution or reverse osmosis downstream when UV is used in pretreatment. These components address the endotoxin hazard that bacterial killing can leave behind. UV does not replace chlorine removal, chemical purification or microbial and endotoxin surveillance.
Apply it
A distribution-loop UV lamp is illuminated, but its intensity monitor indicates inadequate output. Investigate the exposure failure and confirm the status of the downstream endotoxin-reducing ultrafilter. Even after adequate UV intensity is restored, lamp operation alone cannot establish acceptable endotoxin levels.
Common pitfall: Bacterial killing does not equal endotoxin removal. A visibly operating UV lamp cannot demonstrate adequate germicidal exposure or the effectiveness of the separate downstream endotoxin barrier.
42.Why are chemical and microbial water checks both necessary?
Chemical measurements and microbial surveillance address different hazards. For the U.S. CMS/RD52:2004 product-water example in Appendix H, V178, bacterial action level is 50 CFU/mL and endotoxin action level is 1 EU/mL; allowable concentrations are below 200 CFU/mL and below 2 EU/mL. Reaching an action level calls for intervention before the maximum limit is reached. Investigate the system, implement the indicated corrective measures and reassess results. Keep these criteria identified with this standard and product-water category: newer standards, other jurisdictions, standard dialysate and ultrapure dialysate have their own applicable criteria.
Apply it
A product-water sample contains 75 CFU/mL bacteria and 0.6 EU/mL endotoxin under the stated CMS/RD52:2004 criteria. The bacterial result exceeds its action level despite remaining below the maximum; the endotoxin result is below its action level. Initiate the microbial corrective process rather than calling both results satisfactory because neither maximum was reached.
Common pitfall: An action level is an early intervention threshold, not the maximum allowable concentration. Normal chlorine or conductivity results cannot cancel a bacterial or endotoxin action-level result.
43.What makes water-system disinfection and records verifiable?
Water-system disinfection requires an approved process compatible with the installed components, followed by required rinsing and release verification. Document the method, timing, relevant measurements, corrective actions and responsible personnel so the process can be assessed. A maintenance signature alone does not establish that water is ready for patient use. Review results and trends against required criteria, and keep the system restricted when release conditions remain unresolved after maintenance or disinfection.
Apply it
A water system has a completed disinfection entry, but the required postprocess release result is missing. Resolve the missing verification before patient use rather than treating the maintenance signature as sufficient evidence that all release conditions were satisfied.
Common pitfall: Documentation of an action is different from verification of its outcome. A recorded disinfection cycle does not independently demonstrate acceptable residual chemicals or water quality.
CMS State Operations Manual, Appendix H — ESRD Facilities · BONENT CHT Examination Content Outline
Infection Control18%
44.When must gloves be changed and hands cleaned?
Gloves reduce exposure but do not replace hand hygiene. Clean hands at the required care transitions, including before appropriate clean tasks and after glove removal. Change gloves when moving between patients or from contaminated work to a clean task. Use soap and water when hands are visibly soiled; otherwise use the recommended hand-hygiene method for the situation. The key decision follows the task and contamination risk, not whether the same patient is still being treated.
Apply it
After handling used blood tubing, a worker plans to prepare clean access supplies for the same patient. Remove the contaminated gloves, perform hand hygiene and use the required fresh protection before beginning the clean task.
Common pitfall: Same-patient care does not justify carrying contamination from a dirty task into an aseptic task. Glove changes and hand hygiene follow workflow transitions.
CDC’s Core Infection Prevention and Control Practices · Recommendations for Preventing Transmission of Infections Among Chronic Hemodialysis Patients
45.How should unused supplies and reusable equipment be handled after entering a dialysis station?
Dialysis-specific CDC precautions treat items taken into a patient's station as potentially contaminated, even when blood is not visible. Unused medications and single-use supplies taken to the station must not return to the common clean area or be used for another patient. An unopened wrapper does not create an exception, and wiping its exterior does not authorize returning a single-use item to shared stock. Reusable equipment follows a different pathway: appropriately clean and disinfect it before reuse or return to a clean area. Keep used equipment, specimens and waste separate from clean storage and medication preparation areas to prevent transfer of contamination to supplies used for vascular access.
Apply it
After treatment, an unopened gauze package, an unused medication vial and a reusable blood-pressure cuff remain at the station. Do not return the gauze or medication to the central clean cart or use them for another patient; discard station-exposed unused single-use supplies and medications during turnover. Clean and disinfect the reusable cuff according to its compatible procedure before return or reuse, observing the disinfectant's required contact time. Bring only needed supplies to each station to reduce waste.
Common pitfall: Applying reusable-equipment rules to disposable supplies creates a cross-contamination route. A disinfected reusable cuff can return after proper processing; wiping an unopened gauze wrapper does not make that single-use supply eligible for shared stock. The relevant distinctions are station exposure and whether the item is designed for reuse, rather than whether it looks clean.
Recommendations for Preventing Transmission of Infections Among Chronic Hemodialysis Patients · CDC’s Core Infection Prevention and Control Practices · Checklist: Dialysis Station Routine Disinfection
46.When should dialysis-station turnover begin?
CDC's dialysis-station checklist separates completion of patient care from preparation of the next station. Ensure the prior patient has left the station, remove used disposables and manage contaminated items before cleaning and disinfection. Do not place clean supplies into the station while contaminated materials remain. Complete the full environmental process before seating the next patient. The sequence prevents cleaned surfaces and incoming supplies from being recontaminated during unfinished tasks.
Apply it
The next patient arrives while the previous patient remains seated and used tubing is still present. Complete departure and contaminated-item removal, then the required cleaning and disinfection, before bringing in the next patient's clean treatment setup.
Common pitfall: Starting clean setup early does not save a safe step. It can expose incoming supplies to the contaminated environment and create a need for reprocessing.
47.Why does disinfectant contact time matter?
Environmental disinfection depends on using the correct product and keeping the surface wet for the labeled contact time. Remove visible soil as required before disinfection because cleaning and disinfection serve related but different functions. Apply enough product and reapply when necessary to meet the label. CDC's dialysis checklist also addresses allowing the station to dry before reuse. A quick wipe followed by immediate patient placement may leave the process incomplete despite a visibly clean surface.
Apply it
A station surface dries before the disinfectant's labeled wet-contact period ends. Apply the product as directed to complete the required contact time, then allow the station to dry before introducing clean supplies and the next patient.
Common pitfall: Visual cleanliness cannot establish effective disinfection. Product selection, prior cleaning when needed, wet-contact time and completion of drying all affect station readiness.
Checklist: Dialysis Station Routine Disinfection · CDC’s Core Infection Prevention and Control Practices
48.How should shared reusable equipment move between patients?
Reusable equipment must undergo the required cleaning and disinfection before use for another patient. Blood-pressure cuffs, external monitors and other shared items can transfer contamination even when no blood is visible. Follow device compatibility instructions and the appropriate environmental process; patient-contact use determines the need, not appearance alone. Keep contaminated equipment separated from cleaned equipment so its status is clear. Dedicated equipment still requires the appropriate cleaning schedule and handling precautions.
Apply it
A shared blood-pressure cuff appears clean after one patient's treatment and is needed immediately at another station. Complete its required cleaning and disinfection before reuse rather than relying on the absence of visible blood or staining.
Common pitfall: Assigning equipment to a station does not establish that it has been processed. Confirm cleaning status before reuse, particularly when several staff share equipment.
CDC’s Core Infection Prevention and Control Practices · Recommendations for Preventing Transmission of Infections Among Chronic Hemodialysis Patients
49.Where should medications be prepared in a dialysis unit?
Prepare medications in a designated clean area separated from contaminated treatment activities. Do not use a patient's dialysis station as a shared preparation area or carry a common medication source between stations in a way that spreads contamination. Maintain aseptic technique and the required single-patient handling of single-dose products. Cleaning a vial's access surface does not correct an unsafe preparation environment. Protect medication preparation from used equipment, blood specimens and station surfaces.
Apply it
A worker brings a shared medication vial to a station containing used tubing and plans to prepare the next patient's medication there. Stop and use the designated clean preparation process with appropriate medication handling and supplies.
Common pitfall: A clean needle and syringe do not make a contaminated preparation location acceptable. Both aseptic equipment and a protected preparation environment are necessary.
CDC’s Core Infection Prevention and Control Practices · Recommendations for Preventing Transmission of Infections Among Chronic Hemodialysis Patients
50.How does catheter-hub disinfection interrupt bloodstream infection?
A catheter hub can introduce organisms directly into the bloodstream. CDC's Scrub-the-Hub Protocol calls for clamping the catheter before cap removal or disconnection. After removing a cap, use an appropriate antiseptic pad with friction over the hub end and threads, removing visible blood residue. Use a separate pad for each hub, allow the antiseptic to dry and prevent subsequent contact with nonsterile surfaces. At disconnection, disinfect the hub before applying a new sterile cap. Never leave an uncapped catheter unattended. Apply product-specific application times and other requirements from the antiseptic and catheter instructions; a brief touch with a pad does not establish completed disinfection.
Apply it
An operator has removed visible blood and scrubbed one hub's end and threads. Use a separate antiseptic pad for the other hub, allow both to dry and protect them from contact before connection. If a prepared hub touches a contaminated surface, reestablish asepsis and repeat its disinfection before use.
Common pitfall: Fresh gloves and an intact dressing cannot replace hub disinfection. Clamping controls the open catheter pathway, friction and antiseptic address contamination, and drying and protected handling preserve readiness for connection.
Best Practices for Bloodstream Infection Prevention in Dialysis Setting · Guidelines, Recommendations and Resources — Dialysis Safety
51.Why must a prepared cannulation site remain untouched?
Skin antisepsis reduces organisms at the planned needle-entry site. Follow the selected product's application and drying instructions, then preserve the prepared site's aseptic condition. Touching it with a contaminated glove or other nonsterile item can reintroduce organisms. If contamination occurs, repeat the necessary preparation under the approved procedure. The objective is a clean entry pathway at needle insertion, not merely completion of an earlier antiseptic application documented on a checklist.
Apply it
After access-skin preparation, a gloved hand that handled the chair touches the intended needle-entry point. Reprepare the contaminated site according to procedure and restore aseptic handling before cannulation instead of proceeding because antiseptic was already applied.
Common pitfall: A glove is not automatically sterile or clean after environmental contact. Its contamination history matters when it approaches a prepared vascular-access site.
CDC’s Core Infection Prevention and Control Practices · Best Practices for Bloodstream Infection Prevention in Dialysis Setting
52.How should used sharps be discarded?
Discard used needles promptly into an appropriate sharps container located for safe use. Avoid recapping, bending or unnecessary handling that places hands near the sharp. Do not overfill containers or force an item into an unsafe opening. The safe sequence should be planned before the procedure, including access to disposal. Gloves provide a barrier against contamination but cannot reliably prevent puncture injury. Report any exposure immediately through the facility's occupational-exposure process.
Apply it
After needle removal, the nearby sharps container has reached its fill limit. Maintain control of the sharp and use the approved safe disposal arrangement, obtaining replacement assistance rather than forcing the needle into the full container.
Common pitfall: Recapping to carry a needle elsewhere adds an avoidable injury opportunity. Plan immediate disposal and keep sharps containers accessible and within their permitted fill limits.
CDC’s Core Infection Prevention and Control Practices · Recommendations for Preventing Transmission of Infections Among Chronic Hemodialysis Patients
53.Which exposure risks determine protective equipment?
Choose personal protective equipment according to the anticipated task and exposure, including protection against blood contacting clothing, skin, eyes or other mucous membranes. Gloves alone are insufficient when splashing is reasonably anticipated. Standard precautions apply regardless of known infection status. Additional transmission-based precautions depend on the suspected or confirmed infection and local assessment; bloodborne precautions do not replace respiratory precautions when indicated. Remove contaminated protection appropriately and perform hand hygiene after removal.
Apply it
A task may splash blood during disconnection. Select the required gloves, protective clothing and face or eye protection before starting, rather than waiting for a splash or deciding protection is unnecessary because the patient has no known bloodborne infection.
Common pitfall: Known hepatitis status is not the sole basis for protection. Anticipated exposure drives standard precautions, while other infections may require additional transmission-based measures.
CDC’s Core Infection Prevention and Control Practices · Recommendations for Preventing Transmission of Infections Among Chronic Hemodialysis Patients
54.How do HBV and HCV dialysis precautions differ?
HBsAg means hepatitis B surface antigen; positivity identifies patients requiring HBV-specific dialysis isolation. Anti-HBs is antibody to surface antigen and indicates immunity when interpreted with vaccination and serologic history. Anti-HBc is antibody to core antigen, indicating natural exposure and requiring interpretation with the other markers. A patient negative for all three lacks serologic evidence of infection or immunity and is susceptible. CDC recommends a separate room for HBsAg-positive patients, dedicated equipment and supplies, and staff who do not simultaneously care for susceptible patients. Existing facilities without a separate room should use an area removed from mainstream activity with dedicated machines and the required staffing separation. HCV infection alone does not require the same HBV isolation.
Apply it
A patient is HBsAg-negative, anti-HBs-positive and anti-HBc-negative, a pattern consistent with vaccine-induced immunity rather than HBsAg-positive infection. By contrast, confirmed HBsAg positivity activates HBV-specific placement, equipment and staffing arrangements. An isolated positive anti-HBc result needs further interpretation and does not alone establish HBsAg-positive infection.
Common pitfall: Antigen and antibody results answer different questions. A positive hepatitis antibody does not automatically establish current HBsAg-positive infection; absence of a separate room in an existing facility does not remove dedicated-equipment or susceptible-patient staffing protections.
Recommendations for Preventing Transmission of Infections Among Chronic Hemodialysis Patients · Guidelines, Recommendations and Resources — Dialysis Safety
Education and Professional Development10%
55.How does teach-back reveal whether an explanation worked?
Teach-back asks the patient to explain important information in their own words or demonstrate a skill. It checks the clarity of teaching rather than testing the patient's intelligence. Use a respectful invitation, listen for misunderstanding, explain again in a different way and recheck. A yes response to whether the patient understands provides weaker evidence. Focus on a few actionable points, such as access-warning signs or the patient's prescribed fluid plan, rather than overwhelming the learner.
Apply it
After teaching daily access checks, ask the patient to show what they will assess and describe which changes require immediate contact. If the explanation is incomplete, reteach the missing point and ask again using supportive language.
Common pitfall: Repeating the same explanation louder is not a reliable response to misunderstanding. Change the explanation and verify understanding again without blaming the patient.
56.Why should diet and fluid teaching remain patient-specific?
Hemodialysis removes some accumulated wastes and excess fluid but does not continuously replace all kidney functions. Diet, fluid and medication plans therefore remain important between sessions. Reinforce the patient's current instructions rather than inventing a universal fluid allowance, food restriction or medication change. Link explanations to the patient's questions and refer unresolved prescription issues to the nurse or relevant team member. Use teach-back to identify whether the patient can apply the actual plan at home.
Apply it
A patient asks whether a friend's fluid allowance can replace their own. Reinforce the patient's current plan, explain that requirements differ and arrange review with the appropriate team member if thirst or daily implementation is difficult.
Common pitfall: A memorable universal number can be wrong for an individual patient. Accurate reinforcement means using the current patient-specific plan and addressing barriers to following it.
57.What distinctions help explain kidney-replacement options?
Hemodialysis uses an external dialyzer, peritoneal dialysis uses the abdominal lining, and transplantation provides a functioning donor kidney when appropriate. Hemodialysis may be delivered in a center or at home under a suitable program. These options involve different access, training and daily routines. Provide basic factual explanations and support discussion with the multidisciplinary team rather than promising eligibility or choosing for the patient. The CHT outline expects awareness of modalities beyond in-center hemodialysis.
Apply it
A patient asks whether home treatment means using a different organ or membrane. Explain the basic distinction between home hemodialysis and peritoneal dialysis, then connect the patient with the team for individualized education about suitability and training.
Common pitfall: Location and modality are different distinctions. Home hemodialysis remains hemodialysis; discussing options does not establish that a particular patient is eligible for every program.
Hemodialysis — NIDDK · BONENT CHT Examination Content Outline
58.How do incident reports support quality improvement?
Quality improvement uses accurate observations to identify recurring risks, implement a change and measure whether performance improves. Report incidents and near misses through the required process while documenting patient care factually in the medical record. Useful data distinguish what happened, contributing conditions, actions and outcomes without unsupported blame. CDC's dialysis prevention framework combines surveillance, observations, staff feedback and education. A single reminder is not evidence of improvement unless subsequent performance is evaluated.
Apply it
Several observations show missed hub-disinfection steps during rushed changeovers. Report the pattern, support focused training and workflow review, and repeat observations afterward to determine whether reliable performance improved rather than counting attendance alone as success.
Common pitfall: Completing an incident form is not the endpoint of improvement. The team must use the information and evaluate whether the chosen corrective change works.
Best Practices for Bloodstream Infection Prevention in Dialysis Setting · BONENT CHT Examination Content Outline
59.What makes team communication useful and confidential?
Communicate clinically relevant changes with concrete observations, timing, actions and patient response so the receiving team member can act. A vague statement that the patient is unwell gives less guidance than specific symptoms and measurements. Share information through authorized channels and protect patient and employee confidentiality. The CHT outline includes teamwork, constructive communication and confidentiality together because effective care requires both appropriate information exchange and restraint in unrelated disclosure. Confirm that urgent concerns reach the responsible clinician.
Apply it
During handoff, describe when dizziness began, the associated pressure change, the action taken and the current response to the receiving nurse. Move the discussion away from unrelated visitors rather than omitting the information or announcing it publicly.
Common pitfall: Confidentiality does not mean withholding necessary information from the care team. Share relevant facts with authorized recipients while avoiding public or unrelated disclosure.
BONENT CHT Examination Content Outline · CMS State Operations Manual, Appendix H — ESRD Facilities
60.How is procedural competency maintained after initial training?
Competency requires demonstrated performance, not merely attendance at an educational session. Use current procedures, supervised practice and direct observation with feedback for tasks such as catheter care and aseptic access handling. Report uncertainty and seek assistance before performing an unfamiliar or unauthorized task. The CHT outline includes continuing education, precepting and safety procedures; CDC reinforces competency assessment for dialysis infection prevention. Maintain professional boundaries by distinguishing technical proficiency from authority to change a prescription.
Apply it
A revised catheter-care procedure is introduced through an online module. Complete the required observed competency and resolve technique questions before independent performance rather than assuming the completion certificate alone establishes readiness for the changed procedure.
Common pitfall: Experience with an older procedure does not automatically establish competency in a revised one. Education, observed performance and authorization answer related but different questions.
Best Practices for Bloodstream Infection Prevention in Dialysis Setting · BONENT CHT Examination Content Outline
What to focus on during revision
The following are CertMedbry study suggestions. Use the official outline to check the full scope of your examination.
- Connect diffusion, ultrafiltration and treatment time without treating target-weight achievement as proof of adequate clearance.
- Practise fluid-goal, average ultrafiltration-rate and URR calculations with explicit units and assumptions.
- Recognize changes in symptoms, blood pressure, access thrill, bleeding and infection findings that require prompt assessment.
- Separate machine-release checks: residual chemicals, concentrate identity, conductivity, pH, temperature and functioning alarms.
- Map water-system components to their functions and distinguish chemical, microbial and ultraviolet-system monitoring.
- Apply dialysis-specific clean/dirty workflow, station turnover, catheter asepsis and HBV isolation distinctions.
- Use teach-back, precise handoffs, observed competency and measured quality improvement within the CHT role.
A practical preparation plan
1. Map the complete CHT outline
Read all four pages of the official outline. Mark each task as explainable, practised or needing instruction. Use the official 45/12/15/18/10 domain weights to guide study time while retaining every domain.
2. Build a treatment decision sequence
Work through identification, verified weight, baseline assessment, prescription matching, access assessment, monitoring, termination and posttreatment evaluation. For each stage, state the finding that would interrupt routine progression.
3. Calculate and interpret
Practise fluid accounting, treatment-time changes and URR. State assumptions, show units and explain what each result can establish. Keep arithmetic separate from authorization and patient-specific tolerance.
4. Rehearse equipment and water checks
Use the applicable manufacturer instructions and facility procedures to explain each check's purpose, sample location, acceptance criterion and response to failure. Distinguish U.S. regulatory examples from requirements in other jurisdictions.
5. Trace contamination through a shift
Follow hands, gloves, shared devices, medications, used supplies and clean stock through treatment and turnover. Identify each transition requiring hand hygiene, new protection, cleaning, disinfection or disposal.
6. Review errors by mechanism
Complete the 20 drills, then explain why every alternative is less appropriate before checking the explanation. Use flashcards for spaced recall and revisit the relevant primary reference and full outline for persistent gaps.
Use your sample score as a starting point
The free set contains 20 original practice questions. It is a small learning sample, not an official examination or a validated pass prediction. Review each explanation and its source before moving to another topic.
Start the free sampleOfficial sources and updates
- Certified Hemodialysis Technologist/Technician (CHT)
- BONENT CHT Examination Content Outline
- BONENT Candidate Examination Handbook, revised February 2024
- Hemodialysis — NIDDK
- Hemodialysis — National Kidney Foundation
- What Is Dry Weight?
- Hemodialysis Access
- How to Keep Your Vascular Access Healthy
- KDOQI Clinical Practice Guideline for Vascular Access: 2019 Update
- Two Patient Identifiers — Understanding the Requirements
- Operator’s Manuals — Hemodialysis
- 2008T Quick Start Guide, revision D
- CMS State Operations Manual, Appendix H — ESRD Facilities
- Water Purification and Softening Systems Used in Conjunction with Home Dialysis, NCD 230.7
- CDC’s Core Infection Prevention and Control Practices
- Checklist: Dialysis Station Routine Disinfection
- Best Practices for Bloodstream Infection Prevention in Dialysis Setting
- Recommendations for Preventing Transmission of Infections Among Chronic Hemodialysis Patients
- Guidelines, Recommendations and Resources — Dialysis Safety
- Use the Teach-Back Method: Tool 5
- Hemodialysis Access — National Kidney Foundation
- Federal Register :: Request Access
- Peritoneal Dialysis - NIDDK
- Kidney Transplant - NIDDK
- Ultrafiltration | National Kidney Foundation
- FINAL-HD-Guideline.pdf
- Haemodialysis and haemofiltration machines: Actions to take following pressure-related alarms to avoid unintentional alteration of alarm limits DSI/2022/004 - GOV.UK
- FINAL-HD-Guideline.pdf
- NKF KDOQI Guidelines
- Management%2Bof%2BComplications%2Bduring%2BHaemodialysis%2BCG%2BV1.pdf
Confirm current eligibility, fees, scheduling and policies directly with the examination provider. CertMedbry is independent and is not endorsed by these organisations. How we handle content and corrections.