Medical Licensing (MD/DO) · Independent exam preparation
Internal Medicine Written Exam Study Guide
Practise diagnostic distinctions, urgent treatment choices, screening criteria and clinical calculations for AOBIM primary certification in internal medicine.
By CertMedbry · Updated 19 October 2026
Learn to distinguish similar presentations, interpret diagnostic tests and choose treatments that address the immediate clinical problem. These 60 concepts emphasize selected decisions across the AOBIM Internal Medicine Written Exam's clinical categories and cross-content areas. The official online outline defines the full examination scope; this guide provides selective teaching and original practice.
Try 20 free practice questionsWhat is the exam format?
Check the question types, timing and outline before planning your revision.
Which certification examination does this guide cover?
It covers the Internal Medicine Written Exam within AOBIM's primary-certification pathway. AOBIM administers the examination and recommends successful candidates for certification; the AOA approves certification and issues the certificate. This is specialty board certification. Subspecialty examinations and continuing-certification assessments have separate requirements.
AOBIM: Written Exam · AOBIM: Internal Medicine Certification Timeline
How many questions and sections does the examination contain?
The official page describes 320 items divided into four sections of 80 items. A scored-versus-pretest item allocation is not stated here.
How much testing time is allocated?
Each of the four sections allows two hours, totaling eight testing hours. This averages 90 seconds per item. Testing time should be distinguished from total appointment time, which can include administrative procedures and breaks.
What format do these practice questions use?
The 20 original practice questions use four options and one best answer. They are independently authored educational materials rather than official examination items, and their format does not establish every item style used on the examination. Each explanation identifies the correct answer by its option text and explains the alternatives.
Which outline and effective date apply?
The undated official online outline states no blueprint version or effective date. The page lists March 4–6, 2026 for the Internal Medicine Early Entry Written Exam and September 16–18, 2026 for the fall Internal Medicine Written Exam. Administration dates do not establish a blueprint effective date. The complete official outline remains the scope reference.
How should the published percentage ranges guide study?
The issuer presents clinical categories and cross-content areas separately. Their ranges should not be combined into one mutually exclusive distribution. Larger clinical ranges include Gastroenterology and Pulmonology at 9–13%, Infectious disease and Nephrology/hypertension at 8–12%, and Endocrinology at 7–11%. Clinical epidemiology is a cross-content area at 6–10%. Cardiology is published at 1–4%. This selective guide includes every named domain, but its examples do not exhaust the topics within those domains.
Do these learning questions establish a passing score or readiness prediction?
These 20 original questions support explanation, calculation and error analysis. They do not establish an official passing threshold or predict certification outcomes. Use the issuer's current instructions for scheduling, fees and examination policies.
This guide addresses primary certification in internal medicine through clinically focused teaching, original questions and flashcards. The learning materials emphasize mechanisms, discriminating findings and decision boundaries across the published domains.
Outline used: Undated official online Exam Content Outline for Primary Certification: Internal Medicine, opened on 2026-10-10 Asia/Hong_Kong. No blueprint version or effective date is stated. The page lists 2026 examination administrations. The workbook label 'American Osteopathic Board of Internal Medicine - Certification' maps to this primary-certification Internal Medicine Written Exam; 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.
Allergy/Immunology1-5%
1.When does an allergic reaction require immediate epinephrine?
Anaphylaxis is a rapidly developing systemic hypersensitivity reaction that can threaten breathing or circulation. Acute hypotension, bronchospasm or laryngeal involvement after a known or highly probable allergen can occur without hives. Prompt intramuscular epinephrine is the first-line treatment; satisfying every formal diagnostic criterion is unnecessary before treating suspected anaphylaxis. Antihistamines may relieve skin symptoms but do not replace epinephrine for airway compromise or shock. A normal tryptase result does not exclude the clinical diagnosis.
Apply it
Minutes after an antibiotic infusion, a patient develops wheezing, hoarseness and hypotension without a rash. Recognize suspected anaphylaxis, administer intramuscular epinephrine promptly and mobilize emergency support while reassessing airway and circulation.
Common pitfall: Waiting for urticaria, a tryptase result or a response to antihistamines delays treatment. Severe respiratory or circulatory involvement can establish the emergency without skin findings.
Cardiology1-4%
2.Which medication classes form foundational HFrEF therapy?
Foundational treatment of chronic heart failure with reduced ejection fraction combines an angiotensin receptor–neprilysin inhibitor, an evidence-based beta-blocker, a mineralocorticoid receptor antagonist and an SGLT2 inhibitor. An ACE inhibitor or ARB can substitute when the preferred renin–angiotensin strategy is unsuitable. These classes address complementary disease pathways and improve outcomes. Diuretics treat congestion but do not substitute for the four foundations. Initiation and titration require assessment of stability, blood pressure, renal function and potassium.
Apply it
A stable outpatient with an ejection fraction of 30% takes a beta-blocker and loop diuretic. Review blood pressure, renal function and potassium, then identify the missing foundational medication classes rather than assuming symptom relief completes treatment.
Common pitfall: A patient who becomes less breathless after diuresis may still lack therapies that improve long-term outcomes. Congestion control and disease-modifying treatment answer different clinical needs.
3.Why continue heart failure treatment after ejection fraction improves?
Improvement in ejection fraction often reflects successful treatment rather than permanent removal of the underlying cardiomyopathy. The heart failure guideline recommends continuing guideline-directed therapy in patients with improved ejection fraction to reduce relapse, including when symptoms resolve. SGLT2 inhibitors also benefit appropriate patients with HFrEF regardless of whether they have diabetes. A recovered measurement therefore changes the description of ventricular function without automatically removing the indication for disease-modifying treatment.
Apply it
After treatment, a patient's ejection fraction rises from 28% to 52%, and exercise tolerance normalizes. Explain why foundational therapy generally continues, while reviewing tolerance and adjusting congestion-directed medication according to current volume status.
Common pitfall: Stopping all heart failure medication because one echocardiogram is normal confuses treatment response with cure. Absence of diabetes also does not negate HFrEF benefit from SGLT2 inhibition.
Dermatology1-4%
4.Which changes make a pigmented lesion suspicious for melanoma?
The ABCDE framework highlights asymmetry, an irregular border, varied color, diameter and evolution. Evolution includes changes in size, shape or color and helps identify a lesion that differs from its previous appearance. Diameter greater than about 6 mm is a warning feature, but melanomas can be smaller. The framework supports recognition and clinical evaluation rather than confirming a diagnosis. A changing lesion deserves attention even when it is small or lacks every other feature.
Apply it
A patient shows a 4-mm mole that has developed an irregular edge and two new colors over several months. Recommend prompt assessment because documented evolution and color variation outweigh reassurance based solely on small diameter.
Common pitfall: Using diameter as a rule-out criterion misses smaller melanomas. A lesion need not satisfy every ABCDE feature before its changing appearance warrants clinical evaluation.
34.Which cutaneous symptoms require stopping allopurinol and urgent assessment?
Allopurinol can cause serious adverse reactions signaled by rash, itching or hives; blistering, peeling or shedding skin; mouth swelling; eye irritation; fever or other systemic symptoms. Its drug information instructs patients to stop treatment and obtain immediate medical advice or emergency treatment when these occur. Skin findings with mucosal or systemic involvement are especially concerning. Do not assume a new eruption is a harmless consequence of gout or chemotherapy.
Apply it
After starting allopurinol, a patient develops a rash with fever, painful mouth lesions and blistering skin. Stop allopurinol and obtain emergency assessment rather than treating the itching alone while continuing exposure.
Common pitfall: Waiting for extensive skin detachment can delay recognition of a serious reaction. Symptomatic improvement with an antihistamine would not establish that continued allopurinol is safe.
Endocrinology7-11%
5.How do antibodies produce hyperthyroidism and eye disease in Graves disease?
Thyroid-stimulating antibodies activate the TSH receptor, causing excess thyroid hormone production despite suppression of pituitary TSH. Weight loss, heat intolerance, tremor and palpitations support thyrotoxicosis; diffuse goiter and thyroid eye disease strengthen the Graves diagnosis. Orbital autoimmune inflammation can cause eye prominence, irritation, swelling or double vision independently of current thyroid hormone levels. Smoking increases eye-disease risk and severity, so biochemical control does not establish resolution of orbital disease.
Apply it
A patient with suppressed TSH, elevated thyroid hormone and diffuse goiter has Graves hyperthyroidism. If double vision develops after thyroid levels normalize, assess the orbital disease separately and address smoking exposure.
Common pitfall: Palpitations alone do not establish Graves disease, and normal thyroid hormone values do not prove that associated eye disease is inactive. Changing vision requires its own assessment.
6.When should empagliflozin or ertugliflozin be interrupted around surgery?
Withhold empagliflozin for at least three days, if possible, before surgery or procedures associated with prolonged fasting; ertugliflozin requires at least four days. Interruption begins before the procedure because their metabolic effects can persist after the last dose. Resume when the patient is clinically stable and oral intake has resumed. Surgery, reduced caloric intake and volume depletion increase ketoacidosis risk. Assess suspected ketoacidosis regardless of glucose level; presentation can occur below 250 mg/dL. If ketoacidosis occurs, confirm its resolution before restarting.
Apply it
A patient taking empagliflozin has elective surgery planned with prolonged fasting. Arrange at least three days without empagliflozin before surgery, if possible. Afterward, restart only once clinically stable and eating again; nausea, abdominal pain or breathlessness warrants ketoacidosis evaluation even with near-normal glucose.
Common pitfall: Omitting only the morning-of-surgery dose does not meet the preoperative interruption interval. A glucose value below the usual DKA range does not exclude SGLT2-associated ketoacidosis.
DailyMed - JARDIANCE- empagliflozin tablet, film coated · DailyMed - STEGLATRO- ertugliflozin tablet, film coated
7.How do ACTH measurements and stimulation testing localize adrenal insufficiency?
Synthetic ACTH directly tests adrenal cortisol reserve. An inadequate cortisol rise supports impaired reserve, interpreted with the assay and clinical context. Low cortisol with high baseline ACTH favors primary adrenal failure; low or inappropriately normal ACTH favors a central defect. Soon after pituitary injury, adrenal responsiveness may remain preserved, so an adequate stimulation response can miss recent secondary adrenal insufficiency. Timing therefore changes how confidently a normal response excludes disease.
Apply it
An inadequate cortisol response with high ACTH supports primary adrenal dysfunction. By contrast, low morning cortisol and low ACTH ten days after pituitary surgery remain concerning for central insufficiency even if synthetic ACTH produces an adequate cortisol rise.
Common pitfall: A normal-range ACTH may be inappropriate when cortisol is low. A normal stimulation result shortly after pituitary injury tests retained adrenal capacity and does not establish normal pituitary secretion.
NIDDK: Diagnosis of Adrenal Insufficiency and Addison’s Disease
8.How do Graves treatments differ in purpose and major adverse effects?
Beta-blockers can rapidly reduce tremor and tachycardia but do not stop thyroid hormone production. Antithyroid medicines reduce new hormone production and take longer to normalize hormone levels. Methimazole can cause potentially life-threatening agranulocytosis: fever or a severe or persistent sore throat requires withholding further doses and obtaining an urgent CBC with differential to assess neutrophils. Do not resume treatment until the treating clinician has evaluated the results and explicitly cleared restarting. Jaundice also requires immediate assessment for liver injury. Radioiodine destroys hormone-producing cells, commonly leads to hypothyroidism and may worsen thyroid eye disease. It is unsuitable during pregnancy or breastfeeding.
Apply it
A patient taking methimazole develops fever and a persistent sore throat. Instruct the patient to withhold further methimazole, obtain an urgent CBC with differential and seek immediate clinical assessment. Treatment must remain withheld until the treating clinician reviews the results and clears restarting.
Common pitfall: Arranging assessment without explicitly withholding methimazole leaves continued exposure unresolved. Do not assume the symptoms represent a routine infection or resume medication simply because the fever improves.
Hyperthyroidism | American Thyroid Association · NIDDK: Graves’ Disease
9.When does a long-acting GLP-1 receptor agonist enter diabetes treatment in CKD?
KDIGO recommends a long-acting GLP-1 receptor agonist for adults with type 2 diabetes and CKD whose individualized glycemic targets remain unmet despite metformin and an SGLT2 inhibitor, or who cannot use those medicines. Prioritize agents with demonstrated cardiovascular benefit. Distinguish inadequate glycemic control from an indication to continue a medication for heart or kidney protection.
Apply it
An adult with type 2 diabetes and CKD remains above the individualized glycemic target despite tolerated metformin and SGLT2 treatment. Consider adding a suitable long-acting GLP-1 receptor agonist.
Common pitfall: A cardiorenal indication does not guarantee adequate glucose lowering. Treatment intensification should address the patient's glycemic target and medication suitability.
Gastroenterology9-13%
10.How should serology, IgA status and gluten exposure guide celiac evaluation?
Tissue transglutaminase IgA is the preferred initial serologic test for most patients eating gluten. Consider total IgA because IgA deficiency can produce a falsely negative IgA result; appropriate IgG-based tests include tissue transglutaminase IgG or deamidated gliadin peptide IgG in an IgA-deficient patient. Gluten restriction can reduce antibody and biopsy findings. Positive serology commonly leads to small-intestinal biopsy in adults. Absence of both HLA-DQ2 and HLA-DQ8 makes celiac disease very unlikely; their presence establishes susceptibility rather than diagnosis and can help interpret an uncertain diagnosis after dietary restriction.
Apply it
An adult with iron deficiency and bloating continues eating gluten but has negative tissue transglutaminase IgA and markedly deficient total IgA. Use appropriate IgG-based testing instead of accepting the negative IgA assay as exclusion.
Common pitfall: Repeating an IgA assay cannot overcome IgA deficiency. Symptomatic improvement without gluten and a positive susceptibility HLA result do not independently establish celiac disease.
11.Which combination of findings establishes acute pancreatitis?
Acute pancreatitis requires at least two of three findings: characteristic abdominal pain, serum amylase or lipase exceeding three times the laboratory upper limit of normal, and characteristic imaging. Typical pain is persistent and epigastric, often radiating to the back. An isolated enzyme elevation is insufficient because nonpancreatic conditions can also elevate these enzymes. Characteristic pain plus qualifying enzymes usually establishes the diagnosis without CT solely for confirmation. CT can clarify an uncertain diagnosis or evaluate complications when improvement fails to occur within 48–72 hours. Ultrasound assesses gallstones as a possible cause. Chronic pancreatitis can cause greasy stools and weight loss from impaired digestion. See the [ACG acute pancreatitis guideline](https://pmc.ncbi.nlm.nih.gov/articles/PMC13221274/).
Apply it
A patient has characteristic persistent epigastric pain radiating to the back and lipase five times the upper limit of normal. Two criteria are met, so CT is usually unnecessary solely to confirm acute pancreatitis. Assess clinical severity and investigate the cause, including gallstones.
Common pitfall: Counting elevated amylase and elevated lipase as two separate criteria is incorrect; they constitute one enzyme criterion. An enzyme elevation alone does not establish pancreatitis, and enzyme magnitude does not reliably measure severity.
12.Which findings should direct attention to gastrointestinal blood loss?
Gastrointestinal bleeding can deplete iron stores through continuing blood loss. Ulcers, inflammatory bowel disease and colon cancer are possible causes; aspirin and NSAIDs can also contribute to GI bleeding. Recurrent iron deficiency despite an adequate diet should therefore prompt a bleeding and medication history alongside assessment for impaired absorption. Identifying NSAID exposure supplies a possible contributor, but does not establish the bleeding lesion or exclude another cause.
Apply it
An adult with recurrent iron deficiency regularly takes naproxen and reports intermittent dark stools. Review medication-related bleeding risk and investigate a GI source while replacing iron.
Common pitfall: Attributing the entire problem to diet or to one medication can leave an ulcer, inflammatory disease or malignancy unidentified.
13.How should overt GI bleeding and circulatory compromise change urgency?
Vomiting bright blood or coffee-ground material and passing black, tarry stool are warning signs of acute GI bleeding. Fainting, tachycardia, confusion, cool extremities or other shock findings make immediate stabilization and emergency assessment the priority. Possible upper-tract causes include peptic ulcers, gastritis, varices and vomiting-related tears; the presentation alone does not identify the lesion. Chronic occult bleeding may instead first appear as iron-deficiency anemia.
Apply it
A patient with cirrhosis vomits blood and becomes confused and tachycardic. Activate emergency assessment and circulatory support while investigating the bleeding source; do not wait for outpatient iron studies.
Common pitfall: A familiar history of anemia does not make new overt bleeding a routine replacement problem. NSAID use or cirrhosis suggests possible causes without proving a specific lesion.
14.When does ascitic fluid support spontaneous bacterial peritonitis?
In a patient with cirrhosis and ascites, an ascitic polymorphonuclear neutrophil count of at least 250 cells/mm³ supports spontaneous bacterial peritonitis and warrants treatment without waiting for culture positivity. Diagnostic paracentesis on admission identifies infection that may lack prominent abdominal symptoms. The absolute neutrophil count matters, rather than the total white-cell count alone. Culture-negative neutrocytic ascites can still require treatment because bacterial culture does not detect every clinically important infection.
Apply it
A hospitalized patient with cirrhosis and ascites develops confusion without fever or abdominal tenderness. Paracentesis shows 500 white cells/mm³ with 60% neutrophils, giving 300 neutrophils/mm³ and supporting treatment for spontaneous bacterial peritonitis.
Common pitfall: Waiting for a positive culture delays treatment when the neutrophil threshold is met. Absence of fever or abdominal pain does not reliably exclude ascitic infection.
AASLD: Why Timing Matters—Paracentesis on Admission for Cirrhosis with Ascites
15.How does the serum–ascites albumin gradient classify ascites?
The serum–ascites albumin gradient, or SAAG, equals serum albumin minus ascitic fluid albumin, using samples obtained close together. A gradient of at least 1.1 g/dL supports portal hypertension as the mechanism of ascites. It does not uniquely identify cirrhosis, because other disorders can also elevate portal pressure. SAAG answers a hemodynamic classification question; ascitic neutrophils answer an infection question. Both can be relevant in the same patient and should be interpreted separately.
Apply it
Serum albumin is 3.0 g/dL and ascitic albumin is 1.2 g/dL. Calculate a SAAG of 1.8 g/dL, supporting portal hypertension, then evaluate the ascitic neutrophil count separately for possible infection.
Common pitfall: A high SAAG does not prove that ascites is sterile or that cirrhosis is its only possible cause. It identifies a pressure-related mechanism rather than every diagnosis.
AASLD: Why Timing Matters—Paracentesis on Admission for Cirrhosis with Ascites
Hematology4-8%
16.Why does low ferritin support iron-deficiency anemia?
Ferritin reflects stored iron, so a low ferritin concentration supports depleted iron reserves. Iron is needed for hemoglobin production; insufficient availability can eventually produce smaller, less hemoglobin-rich red cells. Ferritin interpretation is asymmetric because inflammation can elevate it, making a normal or high value less reassuring in an inflammatory setting. Deficiency can result from inadequate intake, ongoing blood loss or impaired absorption. Establishing depleted stores does not identify which mechanism caused them.
Apply it
A patient with fatigue has anemia, small red cells and clearly low ferritin. Diagnose depleted iron stores, then assess dietary intake, menstrual or gastrointestinal loss and possible malabsorption.
Common pitfall: A normal ferritin result during inflammation does not exclude iron deficiency as confidently as a low result supports it. Improvement with iron also does not establish a dietary cause.
NHLBI: Iron-Deficiency Anemia · ferritin-guidelines-executivesummary.pdf
17.How do renal function and bleeding risk determine dabigatran interruption?
For dabigatran with creatinine clearance of 30–50 mL/min, KDIGO Figure 44 lists interruption of at least 48 hours before a low-bleeding-risk procedure and at least 96 hours before a high-risk procedure. Reduced renal clearance prolongs exposure, and greater bleeding consequences justify the longer interval. Routine bridging with low-molecular-weight or unfractionated heparin is unnecessary for these DOAC interruptions.
Apply it
A patient taking dabigatran has stable creatinine clearance of 40 mL/min and an elective high-bleeding-risk procedure. Allow at least 96 hours between the last dose and the procedure. The corresponding low-risk interval is at least 48 hours.
Common pitfall: These intervals apply to the specified agent, renal range and procedural risks; they are not universal schedules. They do not establish postoperative restart timing or settle neuraxial-anesthesia requirements, acute kidney injury or emergency surgery decisions.
18.How should recurrent anemia after iron replacement be interpreted?
A hematologic response to iron replacement shows that inadequate iron availability contributed to anemia, but recurrence suggests the balance of absorption, demand and loss remains unfavorable. Reassess adherence and tolerance, ongoing blood loss and impaired absorption rather than repeatedly treating the laboratory abnormality without explanation. Clinical context determines the investigation. A patient who initially improves and later relapses presents a different problem from one whose hemoglobin never responds, so the time course provides useful diagnostic information.
Apply it
A patient's hemoglobin improves during iron treatment but falls again months later, with low ferritin. Review ongoing menstrual or gastrointestinal losses and absorption problems, using the initial response and subsequent recurrence to guide the evaluation.
Common pitfall: A successful first course does not establish permanent correction or eliminate the need to investigate the cause. Repeated deficiency should prompt renewed attention to ongoing losses.
Infectious disease8-12%
19.What does a positive tuberculosis infection test establish?
A positive interferon-gamma release assay or tuberculin skin test indicates evidence of tuberculosis infection, but neither test distinguishes latent infection from active disease. Evaluation therefore includes symptoms, medical history, examination and chest imaging, with bacteriologic testing when disease is suspected. Latent tuberculosis infection is diagnosed only after active disease has been excluded. The decision depends on the clinical evaluation, rather than treating every positive immune test as proof of contagious pulmonary tuberculosis.
Apply it
An asymptomatic adult has a positive interferon-gamma release assay during screening. Review exposure and symptoms and obtain appropriate chest evaluation before classifying latent infection; add sputum testing if findings suggest active pulmonary tuberculosis.
Common pitfall: Starting a latent-infection plan solely from a positive immune test can overlook active disease. The test detects an immune response and does not establish disease activity.
20.Why can a negative tuberculosis infection test be misleading?
Negative immune-based tuberculosis tests do not exclude active tuberculosis in a patient with a compatible presentation. Immune responses may be impaired or not yet detectable, and some patients with disease have negative results. Persistent cough, systemic symptoms, exposure history and suspicious imaging should therefore drive further diagnostic evaluation. Respiratory microscopy, molecular testing and culture provide complementary information: a negative smear does not exclude disease, and acid-fast organisms on microscopy do not establish the species.
Apply it
An immunocompromised patient has weight loss, prolonged cough and suspicious chest imaging despite a negative interferon-gamma release assay. Continue evaluation with respiratory specimens for molecular testing, microscopy and culture rather than ending the investigation.
Common pitfall: Neither a negative immune test nor a negative smear reliably excludes a strongly compatible presentation. Conversely, smear positivity alone does not prove that the organism is Mycobacterium tuberculosis.
21.Why reconsider aminoglycosides when kidney injury develops?
Aminoglycosides accumulate in proximal tubular cells and can cause acute tubular injury. Their activity against an organism therefore does not establish that continued exposure is safe for the patient. Rising creatinine during treatment should prompt reassessment of antimicrobial necessity, kidney function and the availability of another effective agent. The clinical decision must preserve adequate infection treatment while reducing avoidable kidney toxicity; simply labeling the infection susceptible does not resolve that balance.
Apply it
A patient receiving an aminoglycoside develops rising creatinine. Reassess the timing of exposure and kidney injury, review whether the agent remains necessary and determine whether an effective alternative can provide appropriate infection coverage.
Common pitfall: Microbial susceptibility measures antimicrobial activity rather than patient tolerance. Conversely, stopping an antibiotic without ensuring adequate replacement can leave the infection undertreated; efficacy and toxicity must be assessed together.
22.How are discordant reverse-sequence syphilis results resolved?
Reverse-sequence screening starts with a treponemal assay and follows a reactive result with a quantitative nontreponemal test. If the treponemal screen is reactive but the nontreponemal test is nonreactive, use a different treponemal assay, preferably TP-PA, to adjudicate the discrepancy. A second positive treponemal result can reflect previously treated infection or untreated infection; treatment history and exposure determine the next step. A single discordant pair should not automatically be labeled a false positive or new infection.
Apply it
A reactive treponemal immunoassay is followed by a nonreactive RPR in a patient with uncertain treatment history. Order a different treponemal test to clarify the serologic pattern before deciding how prior therapy and recent exposure affect management.
Common pitfall: Repeating the identical screening assay does not provide the recommended independent adjudication. A nonreactive RPR also does not by itself prove the first result was false.
CDC Laboratory Recommendations for Syphilis Testing, United States, 2024 · CDC: Syphilis—STI Treatment Guidelines
23.Which syphilis titer change is clinically significant?
A fourfold change in a nontreponemal titer, equivalent to two serial dilution steps, is considered clinically significant when results are obtained with the same test method. For example, 1:32 to 1:8 is a fourfold decline, whereas 1:8 to 1:16 is only a twofold increase. RPR and VDRL values should not be directly interchanged for longitudinal comparison. Treponemal tests often remain reactive after treatment and are generally unsuitable for measuring treatment response.
Apply it
A patient's RPR falls from 1:64 to 1:16 using the same laboratory method. Recognize a fourfold decline; compare that with a change from 1:16 to 1:8, which represents only one dilution step.
Common pitfall: Treating any numerical change as significant overinterprets ordinary variation. Comparing different nontreponemal methods or following treponemal positivity can also misrepresent the patient's treatment response.
Nephrology/hypertension8-12%
24.Why does intravenous calcium come first in hyperkalemic cardiotoxicity?
Severe hyperkalemia disrupts cardiac electrical activity and can produce dangerous conduction abnormalities. Intravenous calcium counteracts the membrane effects and is indicated when hyperkalemia causes concerning ECG changes. Calcium does not meaningfully lower the serum potassium concentration, so stabilization must be followed by measures that shift potassium into cells and remove potassium from the body. A patient with electrical toxicity therefore requires parallel attention to immediate cardiac protection, potassium reduction and repeated monitoring for recurrence.
Apply it
A patient with kidney failure has potassium of 7.1 mmol/L and QRS widening. Give intravenous calcium for cardiac protection while arranging potassium-shifting and removal measures; do not interpret ECG improvement as correction of the potassium excess.
Common pitfall: Calcium can improve electrical stability while potassium remains dangerously elevated. Stopping treatment after ECG improvement leaves the underlying electrolyte problem unresolved and permits recurrent cardiotoxicity.
Acute Hyperkalemia in the Emergency Department: KDIGO Conference Summary
25.How do potassium redistribution, elimination and insulin safety differ?
Insulin and beta-adrenergic treatment shift potassium into cells without removing it. Elimination requires renal excretion when feasible, gastrointestinal binding or dialysis. Insulin can cause hypoglycemia: intravenous glucose administration depends on baseline glucose and the treatment protocol. Check glucose before treatment and monitor it afterward alongside potassium and cardiac status. Potassium can rebound as redistribution wears off.
Apply it
In an anuric patient, a potassium fall after insulin is temporary redistribution. Provide glucose as indicated, monitor for hypoglycemia and recurrent hyperkalemia, and arrange definitive potassium removal.
Common pitfall: An improved potassium result neither proves elimination nor removes the need for glucose surveillance. Initial hyperglycemia does not eliminate subsequent hypoglycemia risk.
Acute Hyperkalemia in the Emergency Department: KDIGO Conference Summary
26.How should a spot urine albumin-to-creatinine ratio be obtained and calculated?
A first-morning spot urine specimen is preferred for UACR; a random sample is acceptable when necessary, and routine assessment generally does not require a 24-hour collection. UACR divides urine albumin by urine creatinine, commonly expressed as milligrams of albumin per gram of creatinine. Convert creatinine measured in milligrams to grams before calculating mg/g. The ratio reduces the influence of urine dilution compared with albumin concentration alone.
Apply it
A first-morning sample contains albumin of 12 mg/dL and creatinine of 100 mg/dL. Convert creatinine to 0.1 g/dL, then calculate 12 divided by 0.1, giving a UACR of 120 mg/g.
Common pitfall: Dividing the raw numbers without converting creatinine units gives 0.12 and conceals the degree of albuminuria. Requiring a 24-hour collection for every patient can unnecessarily delay assessment.
27.What blood pressure target does KDIGO suggest for adults with hypertension and nondialysis CKD who are not kidney transplant recipients?
KDIGO suggests a systolic blood pressure target below 120 mm Hg, when tolerated, for adults with hypertension and nondialysis CKD who are not kidney transplant recipients. The target requires standardized office blood pressure measurement; measurement technique, population eligibility and tolerability are essential qualifications. KDIGO provides a separate target below 130/80 mm Hg for adult kidney transplant recipients, also using standardized office measurement. The systolic target below 120 mm Hg does not extend to dialysis patients. Symptomatic postural hypotension or very limited life expectancy can justify less intensive treatment.
Apply it
For an adult with hypertension and nondialysis CKD without a transplant, a standardized office systolic pressure of 128 mm Hg remains above the suggested target, provided further lowering is tolerated. If treatment intensification causes standing dizziness, reassess postural pressure and medications before pursuing additional lowering. In contrast, a kidney transplant recipient with standardized office pressure of 128/76 mm Hg meets the separate transplant target below 130/80 mm Hg.
Common pitfall: Do not apply the systolic target below 120 mm Hg to every patient labeled as having CKD. Kidney transplant recipients have a separate target, and dialysis patients fall outside this recommendation. Casual office readings cannot be interpreted as equivalent to standardized measurements. Continuing medication escalation despite symptomatic postural hypotension also disregards the tolerability qualification.
28.When does albuminuria establish chronic kidney damage?
CKD requires relevant abnormalities of kidney structure or function present for at least three months. KDIGO albuminuria categories are A1 below 30 mg/g, A2 from 30–300 mg/g and A3 above 300 mg/g. Persistent ACR of at least 30 mg/g can establish kidney damage despite preserved estimated filtration. Albuminuria and filtration measure different aspects of kidney health, and one abnormal urine measurement does not establish chronicity.
Apply it
A patient has preserved estimated filtration and ACR of 85 mg/g, within A2. Confirm the finding and establish whether it persists for at least three months before classifying it as chronic albuminuric kidney disease.
Common pitfall: Normal estimated filtration does not exclude albuminuric CKD. Conversely, an isolated elevated ACR cannot establish that kidney damage has persisted for the required duration.
42.When does respiratory compromise from uncontrolled volume overload require dialysis assessment?
KDIGO identifies inability to control volume status as an indication for dialysis. In kidney failure, severe respiratory compromise from documented volume overload despite medical treatment is a clinically important failure of volume control. Dialysis initiation integrates symptoms, signs, laboratory abnormalities, quality of life and patient preferences rather than relying on a filtration threshold alone. The key distinction is between reduced kidney function without an uncontrolled complication and a current complication that medical treatment cannot adequately manage.
Apply it
A patient with kidney failure has worsening breathing difficulty from documented volume overload despite treatment. Obtain urgent dialysis assessment while addressing respiratory needs; waiting for a lower eGFR can prolong the uncontrolled complication.
Common pitfall: An eGFR value cannot establish respiratory safety. Conversely, breathlessness alone does not prove volume overload: identify the cause and document failure of volume control before attributing the dialysis indication to fluid excess.
Neurology2-6%
29.Which weakness pattern suggests myasthenia gravis?
Myasthenia gravis is an autoimmune disorder of neuromuscular transmission that produces skeletal muscle weakness, often worsening with activity and improving with rest. Ptosis and double vision are common clues, and bulbar involvement may affect speech, chewing or swallowing. Fluctuation across tasks and time helps distinguish the pattern from a fixed focal deficit. The clinical question is whether repeated muscle use unmasks weakness, especially in ocular or bulbar muscles, rather than whether the patient simply feels generally tired.
Apply it
A patient develops double vision late in the day and has progressively drooping eyelids during sustained upward gaze. Ask about chewing, swallowing and speech fatigue, and evaluate a neuromuscular-junction disorder rather than treating the complaint as nonspecific tiredness.
Common pitfall: General fatigue is common and does not establish myasthenia. The discriminating finding is activity-related muscle weakness, particularly when ocular or bulbar involvement fluctuates.
30.How do antibodies and electrophysiology complement a myasthenia assessment?
Test for acetylcholine-receptor antibodies and, when these are negative, muscle-specific kinase (MuSK) antibodies. A negative antibody result alone does not exclude myasthenia because some patients lack detectable antibodies on these assays. Low-frequency repetitive nerve stimulation can demonstrate a decrement in compound muscle action potential amplitude, reflecting failure of neuromuscular transmission during repeated activation. Testing clinically involved muscles improves diagnostic yield because abnormalities can be absent in less affected muscles; facial-muscle testing is particularly relevant with facial or bulbar weakness. Antibody studies assess autoimmunity, while electrophysiology assesses transmission failure. Supporting primary study: [Repetitive Nerve Stimulation in MuSK-Antibody-Positive Myasthenia Gravis](https://www.thejcn.com/DOIx.php?id=10.3988/jcn.2017.13.3.287).
Apply it
An adult has fluctuating ptosis and chewing weakness but negative acetylcholine-receptor antibodies. Test for MuSK antibodies and assess neuromuscular transmission in clinically involved muscles, including suitable facial muscles. A decrement during low-frequency repetitive stimulation supports impaired transmission. Consider thymic imaging as part of the broader evaluation.
Common pitfall: Negative antibodies or normal repetitive stimulation of an uninvolved limb muscle cannot independently exclude myasthenia. Match the tested muscles to the clinical distribution and interpret electrophysiology alongside fatigability and antibody results.
MedlinePlus: Myasthenia Gravis · Myasthenia Gravis Tests: MedlinePlus Medical Test
Obstetrics and gynecology1-4%
31.When can natural menopause be diagnosed retrospectively?
Natural menopause is recognized after 12 consecutive months without a menstrual period when another cause does not explain the absence. It is a retrospective definition rather than a diagnosis made from one missed cycle or a single hot flash. During the transition, hormone production and cycle regularity can fluctuate. The important distinction is between perimenopausal changes and established menopause, while accounting for factors such as hormonal treatment or illness that can complicate interpretation of absent bleeding.
Apply it
A patient has irregular cycles, hot flashes and eight months without bleeding. Describe a possible menopausal transition rather than established natural menopause, and assess whether pregnancy, medication or another condition could explain the menstrual change.
Common pitfall: Equating irregular periods or several months of amenorrhea with completed menopause applies the retrospective definition too early. Hormonal treatment can also obscure the meaning of absent bleeding.
Oncology6-10%
32.Which adults qualify for USPSTF lung cancer screening, and what harms should be discussed?
The USPSTF recommends annual low-dose CT for adults aged 50–80 years with at least a 20 pack-year smoking history who currently smoke or quit within the past 15 years. Screening addresses people without symptoms suggestive of lung cancer and requires a realistic opportunity to benefit from treatment. Discuss false positives, incidental findings, radiation and overdiagnosis; a detected nodule does not establish cancer or automatically require invasive testing. Calculate pack-years by adding packs per day multiplied by years for each smoking period.
Apply it
An asymptomatic 58-year-old smoked two packs daily for eight years and half a pack daily for twelve years, totaling 22 pack-years. Check cessation interval and treatment suitability, then discuss benefits, harms and willingness to complete follow-up before offering screening.
Common pitfall: Counting smoking years without intensity misclassifies exposure. Screening eligibility cannot exclude diagnostic evaluation of hemoptysis, and a positive screening scan does not itself diagnose malignancy.
33.When should cancer-associated back pain trigger emergency spinal cord assessment?
In a patient with cancer, back pain accompanied by new limb weakness, gait difficulty, sensory changes or bladder or bowel dysfunction suggests metastatic spinal cord compression. Treat this as an oncologic emergency. NICE recommends MRI as soon as possible, always within 24 hours, and prompt dexamethasone 16 mg orally or an equivalent parenteral dose when neurological symptoms or signs are present, while arranging definitive specialist treatment.
Apply it
A patient with metastatic cancer develops back pain, progressive leg weakness and urinary retention. Initiate the emergency spinal cord compression pathway, urgent MRI and corticosteroid treatment rather than scheduling routine reassessment.
Common pitfall: Analgesic response does not establish neurological safety. New deficits require urgent evaluation even when back pain has been present for weeks.
Recommendations | Spinal metastases and metastatic spinal cord compression | Guidance | NICE
Ophthalmology1-4%
35.Why monitor eye pressure in uveitis treated with steroids?
Uveitis can contribute to glaucoma by affecting drainage of fluid from the eye, and corticosteroid treatment can also raise intraocular pressure. Pressure-related injury may damage the optic nerve, so improvement in inflammation does not eliminate the need to monitor pressure. The discriminating point is that both the ocular disease and its treatment can create risk. New visual symptoms or documented pressure elevation require reassessment rather than assuming that every change reflects uncontrolled inflammation alone.
Apply it
A patient receiving steroid eye drops for uveitis has improving redness but elevated intraocular pressure at follow-up. Recognize inflammation-related and treatment-related mechanisms, and arrange coordinated reassessment of pressure control and the anti-inflammatory regimen.
Common pitfall: Automatically escalating steroids for every visual complaint can worsen pressure elevation in a steroid responder. Redness improvement also does not demonstrate that glaucoma risk has resolved.
Otolaryngology1-4%
36.How is posterior-canal BPPV recognized and treated?
Posterior-canal benign paroxysmal positional vertigo produces brief episodes of vertigo triggered by changes in head position. A characteristic torsional, upbeating nystagmus during the Dix–Hallpike maneuver supports the diagnosis. Canalith repositioning treats the mechanical problem by moving displaced particles out of the involved canal. Routine vestibular suppressants do not correct that mechanism. Persistent symptoms, atypical nystagmus or neurologic findings require reconsideration rather than assuming every positional dizziness complaint is uncomplicated BPPV.
Apply it
A patient has brief spinning when rolling in bed, and Dix–Hallpike testing produces characteristic torsional, upbeating nystagmus. Use a canalith repositioning maneuver rather than relying on repeated medication for transient symptom suppression alone.
Common pitfall: Calling prolonged continuous vertigo BPPV ignores its brief, triggered pattern. Suppressing dizziness pharmacologically does not reposition canaliths or confirm that the diagnosis is correct.
AAO-HNS: BPPV—Updated Best Practices for Diagnosis and Treatment
Psychiatry1-4%
37.How do syndrome, duration and severity distinguish mania from hypomania?
Both require a distinct change to elevated, expansive or irritable mood plus increased energy or activity, present most of the day, nearly every day. Require at least three associated symptoms, or four if mood is only irritable: grandiosity, reduced sleep need, increased or pressured speech, racing thoughts, distractibility, increased goal-directed activity or agitation, and risky involvement. Mania lasts at least one week, or any duration if hospitalization is necessary, with marked impairment, hospitalization or psychosis. Hypomania lasts at least four consecutive days, with an observable change in functioning but no marked impairment, hospitalization or psychosis. Exclude substance, medication and medical explanations. See [SAMHSA episode criteria](https://www.ncbi.nlm.nih.gov/books/NBK571021/?report=reader).
Apply it
Eight days of elevated mood, increased activity, little sleep without fatigue, pressured speech, racing thoughts and financially destructive spending support mania when marked impairment is present and alternative causes are excluded. Four consecutive days of the syndrome without marked impairment, hospitalization or psychosis may support hypomania.
Common pitfall: Duration alone is insufficient. Psychosis excludes hypomania, and reduced sleep need must be distinguished from insomnia with fatigue. A single energetic day does not establish either episode.
Pulmonology9-13%
38.Which objective findings support an adult asthma diagnosis?
Asthma combines variable respiratory symptoms with variable expiratory airflow limitation. In adults, a post-bronchodilator increase in FEV1 or FVC of at least 12% and at least 200 mL from baseline supports variability. An alternative is average daily peak expiratory flow variability above 10% over two weeks. An initially negative study may need repeating during symptoms. Symptoms alone do not confirm asthma, and normal testing between episodes does not always exclude it.
Apply it
FEV1 rises from 2.00 L to 2.28 L after bronchodilator: 280 mL and 14%, meeting both adult criteria. If initial testing is normal despite typical episodic symptoms, repeat during symptoms or assess two weeks of PEF variability.
Common pitfall: Meeting only the percentage or only the volume threshold is insufficient for this bronchodilator criterion. Wheezing alone also does not establish the diagnosis.
GINA 2026 Summary Guide for Asthma Management and Prevention
39.How are pleural effusions classified, and which infection findings require drainage?
Transudative effusions usually reflect altered hydrostatic or oncotic forces; exudative effusions reflect local disease such as infection, inflammation or malignancy. By Light's criteria, an effusion is exudative if any criterion is met: pleural/serum protein ratio greater than 0.5, pleural/serum LDH ratio greater than 0.6, or pleural LDH greater than two-thirds the serum laboratory LDH upper limit of normal. Classification does not itself determine drainage. In suspected pleural infection, frank pus establishes empyema and requires drainage. If fluid is nonpurulent, measure pH promptly: pH at or below 7.2 supports chest-drain insertion when ultrasound confirms safely accessible fluid. Provide appropriate antibiotics alongside drainage.
Apply it
A febrile patient has pneumonia and a new unilateral effusion. Obtain ultrasound-guided diagnostic fluid sampling. A pleural/serum protein ratio of 0.6 establishes an exudate; nonpurulent fluid with pH 7.15 additionally supports drainage when safely accessible. The protein ratio classifies the fluid, while the infection findings determine the drainage decision.
Common pitfall: An exudate is not automatically infected or an indication for drainage. Conversely, frank pus requires drainage without waiting for pH or culture results. Avoid contaminating the pH sample with local anesthetic, which can lower the measured value.
40.What should be checked before stepping up asthma medication?
Before stepping up asthma treatment, assess diagnostic accuracy, inhaler technique, adherence, exposures and contributing comorbidities. Poor technique can prevent an effective drug from reaching the airways. Adults and adolescents should receive an ICS-containing strategy: inhaled corticosteroids address inflammation and reduce severe exacerbation risk, whereas SABA alone mainly relieves bronchoconstriction. Infrequent symptoms do not eliminate exacerbation risk. Distinguish inadequate medication intensity from ineffective delivery before adding treatment.
Apply it
A patient remains wheezy after receiving an ICS-containing inhaler. Ask the patient to demonstrate use and review adherence and exposures; a major technique error should be corrected before concluding that the prescribed treatment step has failed.
Common pitfall: Adding medication without observing technique may intensify a regimen the patient is barely receiving. Persistent symptoms also warrant reconsidering the diagnosis instead of assuming all breathlessness is asthma.
GINA 2026 Summary Guide for Asthma Management and Prevention
41.Which spirometric criterion is required for COPD diagnosis?
GOLD requires a post-bronchodilator FEV1/FVC below 0.70 to establish persistent airflow obstruction supporting COPD in a compatible clinical context. Symptoms and relevant exposure history determine suspicion, but post-bronchodilator spirometry provides the required functional confirmation. Imaging may show structural changes or alternative disease, while oxygen saturation measures oxygenation. Neither imaging nor saturation substitutes for the airflow ratio, and pre-bronchodilator obstruction alone does not provide the specified confirmation.
Apply it
A former smoker has chronic breathlessness and radiographic hyperinflation. Obtain spirometry with post-bronchodilator assessment; a ratio of 0.62 supports persistent obstruction when interpreted with the clinical presentation.
Common pitfall: Smoking history, hyperinflation or normal resting oxygen saturation cannot establish or exclude the required airflow abnormality. Confirm the ratio after bronchodilator administration.
Spirometry Quick Guide - Global Initiative for Chronic Obstructive Lung Disease - GOLD · NHLBI: COPD Diagnosis
Rheumatology6-10%
43.Which joint pattern favors rheumatoid arthritis over osteoarthritis?
Rheumatoid arthritis commonly causes symmetric small-joint swelling, tenderness and prolonged morning stiffness, with persistent synovitis and possible extra-articular disease. Osteoarthritis involves cartilage and other joint tissues and more often produces activity-related pain with shorter stiffness. Distribution, symptom behavior and objective examination distinguish them better than age or pain alone. Degenerative imaging findings do not exclude coexisting inflammatory arthritis. Recognizing persistent inflammatory swelling early supports assessment before progressive joint damage.
Apply it
Compare activity-related knee pain and brief stiffness with symmetric swollen knuckles, prolonged morning stiffness and difficulty making a fist. The latter pattern warrants evaluation for inflammatory arthritis even when degenerative changes are also present.
Common pitfall: Joint pain alone is nonspecific. Neither older age nor radiographic degeneration explains persistent symmetric synovitis without further assessment.
44.Which findings suggest giant cell arteritis rather than isolated polymyalgia rheumatica?
In adults older than 50, shoulder and hip-girdle pain with morning stiffness suggests polymyalgia rheumatica. New headache, scalp tenderness, jaw pain with chewing or transient visual loss raises concern for associated giant cell arteritis. Arterial inflammation can compromise ocular blood supply and cause permanent blindness. ESR and CRP support inflammation but are nonspecific; temporal artery biopsy or vascular imaging can support diagnosis. Visual symptoms require immediate assessment and prompt corticosteroid treatment. See [NIAMS diagnosis and treatment](https://www.niams.nih.gov/health-topics/polymyalgia-rheumatica-giant-cell-arteritis/diagnosis-treatment-and-steps-to-take).
Apply it
A 73-year-old with shoulder stiffness develops chewing-related jaw pain and episodes of monocular visual loss. Treat this as threatened vision from possible giant cell arteritis rather than routine musculoskeletal pain.
Common pitfall: Resolution of a visual episode does not establish safety. An elevated inflammatory marker alone cannot identify the vasculitis.
45.What confirms urate crystals as the cause of an arthritis attack?
Gout results from monosodium urate crystal deposition that can trigger intense joint inflammation. Synovial fluid examination under compensated polarized-light microscopy identifies needle-shaped, negatively birefringent monosodium urate crystals. Calcium pyrophosphate crystals are typically rhomboid-shaped and positively birefringent, distinguishing calcium pyrophosphate crystal arthritis from gout. Elevated serum urate alone does not establish the cause of the current arthritis. When infection is suspected, obtain synovial fluid Gram stain and bacterial culture alongside crystal analysis; crystals do not exclude concurrent septic arthritis.
Apply it
A patient has a first acutely swollen joint, fever and elevated serum urate. Aspirate the joint for cell count, crystal examination, Gram stain and bacterial culture. Needle-shaped, negatively birefringent crystals support gout, but continue evaluating infection because crystal arthritis and septic arthritis can coexist.
Common pitfall: Hyperuricemia does not confirm gout, and identifying crystals does not establish that the joint is sterile. Distinguish monosodium urate from calcium pyrophosphate by both crystal shape and birefringence, and obtain microbiologic studies when infection is suspected.
NIAMS: Gout—Diagnosis, Treatment, and Steps to Take · Client Challenge
46.How do urate-lowering drugs differ from gout flare treatment?
Acute gout treatment suppresses inflammation and pain during a flare, whereas long-term urate-lowering treatment reduces the substrate for crystal deposition. Xanthine oxidase inhibitors reduce uric acid production, uricosuric drugs increase renal urate excretion, and uricase-based therapy converts uric acid into a more soluble product. These mechanisms differ from anti-inflammatory treatment. Matching a medication to the clinical objective prevents the assumption that rapid pain relief necessarily lowers urate or that lowering urate immediately treats every component of an acute attack.
Apply it
A patient asks why colchicine relieved a flare but did not eliminate the need for a separate long-term strategy. Explain the distinction between suppressing crystal-triggered inflammation and reducing the urate burden that permits future crystal deposition.
Common pitfall: Classifying every gout medication as urate-lowering obscures its purpose. Anti-inflammatory benefit during an attack does not demonstrate a reduction in the body's long-term urate burden.
Adolescent medicine1-4%
47.How should an adolescent's asthma visit assess actual medication use?
Ask the adolescent to demonstrate technique, identify each inhaler and explain the prescribed schedule. Some regimens use as-needed ICS-formoterol alone; others require daily maintenance ICS-containing treatment, with a separate or shared reliever. Adherence must be judged against the actual regimen. For a patient prescribed daily maintenance doses, taking the inhaler only during symptoms leaves those doses missed. Review understanding, access and practical barriers before escalating treatment.
Apply it
A 16-year-old prescribed daily maintenance ICS-containing treatment uses it only when wheezing and misses scheduled doses. Clarify the maintenance schedule, observe technique and address barriers before deciding that a higher treatment step is needed.
Common pitfall: Symptom-driven use is not automatically an adherence error: it can be correct for a prescribed as-needed anti-inflammatory reliever regimen. Establish which regimen the adolescent was given.
GINA 2026 Summary Guide for Asthma Management and Prevention
Bioethics1-4%
48.How should competing medication risks be discussed after anaphylaxis?
Shared decision-making is appropriate when a medication provides important cardiovascular benefit but may influence anaphylaxis severity or treatment. The 2023 parameter advises against automatically stopping every beta-blocker or ACE inhibitor, particularly when the risk of withdrawing needed therapy may exceed the allergic risk. Discuss the drug's indication, reaction history, exposure likelihood, alternatives and patient preferences. This approach makes the tradeoff explicit and avoids treating theoretical risk as an absolute contraindication regardless of clinical circumstances.
Apply it
A patient with serious cardiovascular disease and previous insect-sting anaphylaxis asks to stop a beta-blocker immediately. Review the cardiac indication, sting risk, available alternatives and venom-allergy treatment options together before making an individualized medication decision.
Common pitfall: A blanket instruction to stop a beneficial drug can create avoidable harm. Shared decision-making requires explaining the competing consequences, rather than simply shifting responsibility to the patient.
Critical care medicine1-4%
49.When does myasthenic weakness become a critical-care emergency?
Myasthenic crisis occurs when respiratory muscle weakness becomes severe enough to threaten breathing. Worsening bulbar weakness can also impair swallowing and airway protection. A patient with known or suspected myasthenia who develops breathing difficulty therefore needs urgent assessment and monitoring, rather than routine outpatient adjustment alone. The decision turns on vital muscle involvement, not simply the duration of the diagnosis or degree of eyelid drooping. Respiratory support may be necessary while the underlying deterioration is treated.
Apply it
A patient with fluctuating ptosis now has rapidly worsening swallowing difficulty, weak speech and breathlessness. Escalate to urgent hospital assessment for respiratory and airway compromise instead of arranging an ordinary follow-up appointment for ocular symptoms.
Common pitfall: Mild-looking ocular findings do not determine respiratory safety. New breathing or swallowing weakness changes the urgency even when the patient's earlier myasthenic symptoms were limited.
Clinical epidemiology6-10%
50.How is diagnostic sensitivity calculated?
Sensitivity is the proportion of people with the target disease who test positive: true positives divided by true positives plus false negatives. Its denominator contains only people who actually have disease. A highly sensitive test misses relatively few affected people, but that does not mean every positive result is correct. Keeping the disease-defined denominator separate from the test-positive denominator prevents confusion with positive predictive value and clarifies which type of error the calculation measures.
Apply it
Among 100 people confirmed to have a disease, a test is positive in 92 and negative in eight. Calculate sensitivity as 92 divided by 100, or 92%, using only the disease-positive group.
Common pitfall: Dividing true positives by all positive tests calculates positive predictive value. Sensitivity asks about detection among affected people, not disease probability after receiving a positive result.
51.How is positive predictive value calculated?
Positive predictive value is the proportion of positive test results that are true positives: true positives divided by true positives plus false positives. Its denominator includes everyone with a positive result, regardless of disease status. The calculation answers a patient's post-test question about how often a positive result corresponds to disease in the studied population. It differs from sensitivity, which starts with people known to have disease and asks whether the test detects them.
Apply it
A screening program produces 80 true-positive and 120 false-positive results. Calculate positive predictive value as 80 divided by 200, or 40%, then explain that most positive results in this example require careful confirmation.
Common pitfall: A test with high sensitivity can still have a modest positive predictive value. Accuracy claims must specify the denominator and population instead of treating every percentage as interchangeable.
52.Why does prevalence change positive predictive value?
When sensitivity and specificity remain fixed, a lower disease prevalence produces fewer true positives relative to false positives, reducing positive predictive value. A higher prevalence generally increases it. This is why a positive result can mean different things in low-risk screening and a high-risk diagnostic population. The calculation depends on both test performance and the population's disease frequency. Evaluating predictive value therefore requires counting expected outcomes in the relevant population rather than transferring one published percentage everywhere.
Apply it
Apply a test with 90% sensitivity and 95% specificity to 1,000 people with 1% prevalence. Expect nine true positives and about 50 false positives, illustrating why most positive results may be false despite apparently strong test characteristics.
Common pitfall: Assuming positive predictive value is a fixed property of the assay ignores population risk. Lowering prevalence can markedly change the meaning of a positive screening result.
Disease prevention1-4%
53.Why should smoking cessation accompany lung cancer screening?
Lung cancer screening and smoking cessation address different parts of prevention. Low-dose CT seeks earlier detection in an eligible high-risk population, while cessation reduces continued exposure and improves health beyond lung cancer alone. A screening visit should include evidence-based cessation support for people who currently smoke. A normal scan does not make ongoing tobacco use safe, and agreeing to cessation should not be mistaken for immediately eliminating the residual risk accumulated through prior smoking.
Apply it
An eligible current smoker receives a normal low-dose CT and concludes that cigarettes have not caused harm. Explain the limits of the scan and offer cessation support while continuing screening according to the applicable recommendation.
Common pitfall: A normal screening result is not a certificate of safety. Screening detects some existing disease; it does not neutralize continued exposure or replace tobacco-dependence treatment.
Geriatric medicine2-6%
54.Why assess volume status before starting empagliflozin in an older adult?
Empagliflozin can cause intravascular volume depletion, symptomatic hypotension and changes in renal function. Older adults, patients with eGFR below 60 mL/min/1.73 m² and those taking loop diuretics have increased risk. Assess renal function and volume status before initiation, correct existing depletion and monitor symptoms and renal function afterward. A beneficial heart failure indication does not remove the need to distinguish current congestion from depleted circulating volume.
Apply it
An older adult taking a loop diuretic has poor intake, standing dizziness and clinical volume depletion. Correct depletion and reassess the medication regimen before starting empagliflozin, then monitor after initiation.
Common pitfall: Age alone is not a reason to exclude treatment, but ignoring poor intake, diuretics and symptomatic hypotension can turn an indicated therapy into an avoidable adverse event.
Nutrition3-7%
55.How can celiac disease produce a nutritional deficiency without diarrhea?
Celiac disease can impair small-intestinal nutrient absorption and present with iron deficiency even when diarrhea is absent or minor. This connects a hematologic finding to an intestinal mechanism rather than assuming all nutritional deficiencies reflect poor intake. Persistent or unexplained iron deficiency can therefore justify considering celiac testing in the appropriate context. Diagnostic testing must still account for gluten exposure and IgA status; the nutritional manifestation raises suspicion but does not independently establish the cause.
Apply it
A patient with an apparently adequate diet has recurrent iron deficiency and little gastrointestinal discomfort. Include impaired absorption, including celiac disease, in the evaluation rather than requiring chronic diarrhea before considering an intestinal cause.
Common pitfall: Absence of diarrhea does not exclude celiac disease. Conversely, iron deficiency has multiple causes, so a nutritional abnormality should guide evaluation rather than automatically determine the diagnosis.
56.How should protein intake be individualized in adults with CKD?
KDIGO suggests approximately 0.8 g protein/kg/day for adults with CKD G3–G5 who are not receiving dialysis, while avoiding intake above 1.3 g/kg/day in those at risk of progression. Avoid low-protein prescriptions during metabolic instability. Older adults with frailty or sarcopenia may require higher protein and calorie targets; preventing malnutrition can outweigh routine restriction.
Apply it
For a metabolically stable 70-kg adult with nondialysis CKD, 0.8 g/kg/day corresponds to 56 g protein daily. Reconsider restriction if weight loss, frailty or muscle wasting develops.
Common pitfall: A protein target is not a universal prescription. Dialysis, metabolic instability and nutritional vulnerability change requirements.
Occupational medicine1-4%
57.How should occupational exposure change anaphylaxis preparedness?
Repeated workplace exposure to an allergen can increase the opportunity for anaphylaxis in a susceptible person. The 2023 parameter identifies frequent occupational exposure as relevant when assessing the need for epinephrine autoinjectors. Prevention should connect the specific exposure with avoidance measures, accessible epinephrine and training in recognition and use. A work-related plan should also establish how coworkers can obtain emergency help. Preparedness supplements exposure reduction because accidental exposure may still occur despite precautions.
Apply it
A worker with previous systemic reactions to latex describes recurring workplace exposure. Review feasible exposure reduction, ensure prescribed epinephrine is readily accessible and rehearse a practical response plan with attention to recognition, administration and emergency assistance.
Common pitfall: Keeping an autoinjector inaccessible during work undermines preparedness. An avoidance plan also needs a response plan because no practical workplace precaution guarantees that accidental exposure cannot occur.
Substance abuse1-4%
58.Why assess substance exposure when evaluating manic symptoms?
Recreational substances, prescribed medications and alcohol use can affect mood symptoms, complicate diagnosis or worsen the course of bipolar disorder. Assessment should establish what was taken, when exposure occurred and how symptoms relate to use, withdrawal and periods without exposure. A sustained syndrome of altered mood, energy and behavior needs evaluation in that context. Neither substance use nor a family history alone settles causation; chronology and the broader medical and psychiatric assessment help distinguish competing explanations.
Apply it
A patient develops reduced sleep need, rapid speech and impulsive behavior after a period of increased substance use. Obtain a detailed exposure timeline and prior episode history while assessing immediate impairment rather than assigning a primary mood diagnosis from symptoms alone.
Common pitfall: Assuming all mood symptoms are substance-induced can miss an independent disorder. Ignoring exposure history can also misclassify a temporally related syndrome and undermine the treatment plan.
OMM/OMT1-4%
59.How does the osteopathic structure–function principle guide assessment?
The AOA tenets state that structure and function are reciprocally interrelated and describe the person as a unit of body, mind and spirit. In clinical assessment, this supports examining how movement, posture and physical findings relate to symptoms and function while considering the person's broader circumstances. The principle guides reasoning; it does not establish that every symptom is mechanically caused or that manipulation is appropriate for every presentation. Clinical findings and diagnostic priorities still determine the management decision.
Apply it
A patient with back discomfort reports reduced walking tolerance and fear of movement. Assess mobility, functional limitations and relevant personal circumstances together, using structural findings to inform care while preserving the broader medical assessment of the presentation.
Common pitfall: Turning a general tenet into proof of a specific mechanical diagnosis overstates its role. Structure–function reasoning should inform examination rather than replace evidence for the patient's actual condition.
60.What does somatic dysfunction describe in osteopathic practice?
Somatic dysfunction describes impaired or altered function of related components of the somatic system, including skeletal, arthrodial and myofascial structures and associated vascular, lymphatic and neural elements. It is a functional assessment concept rather than a synonym for every painful body region. The AOA low-back-pain guideline addresses OMT in a defined clinical context. Applying that scope requires identifying relevant dysfunction and evaluating the presentation, rather than assuming a local pain complaint automatically proves the target finding.
Apply it
During evaluation of low-back pain, examine motion and related musculoskeletal findings to determine whether somatic dysfunction is present. Connect any proposed OMT to the documented findings and clinical assessment rather than to the pain location alone.
Common pitfall: Pain and somatic dysfunction are not interchangeable labels. A functional finding also does not eliminate the need to assess other explanations for the patient's low-back symptoms.
What to focus on during revision
The following are CertMedbry study suggestions. Use the official outline to check the full scope of your examination.
- Use the complete official outline to track scope. Give substantial study time to Gastroenterology, Pulmonology, Infectious disease, Nephrology/hypertension and Endocrinology while retaining every smaller clinical category.
- Study cross-content areas alongside clinical cases: epidemiology calculations, nutrition in malabsorption and CKD, occupational allergen exposure, adolescent asthma, geriatric medication safety and osteopathic assessment.
- Separate immediate protection from definitive correction: epinephrine for anaphylaxis, calcium for hyperkalemic cardiotoxicity and potassium removal after temporary redistribution. Monitor glucose after insulin-based treatment.
- Practise test interpretation under limiting conditions: IgA deficiency, gluten restriction, recent pituitary injury, negative tuberculosis immune tests and discordant syphilis serology.
- Apply operational criteria: CKD abnormalities lasting at least three months, albuminuria categories, standardized blood pressure targets, adult asthma variability thresholds and post-bronchodilator confirmation of COPD.
- Calculate UACR with unit conversion, absolute ascitic neutrophils, SAAG, smoking pack-years, diagnostic sensitivity and positive predictive value.
- Work through medication decisions using the actual agent and clinical conditions: preoperative SGLT2 interruption and restart, dabigatran interruption by clearance and bleeding risk, diabetes intensification, antimicrobial toxicity and serious drug reactions.
- Distinguish airflow obstruction, pleural fluid accumulation and respiratory consequences of uncontrolled volume overload. Recognize when an uncontrolled clinical complication justifies dialysis assessment.
- Recognize urgent changes across systems: overt GI bleeding with circulatory compromise, cancer-associated neurological deficits and giant cell arteritis with visual symptoms.
- Name the recommendation when applying screening criteria, discuss benefits and harms, and distinguish asymptomatic screening from diagnostic evaluation of symptoms.
- Distinguish mania and hypomania using the full syndrome, sustained daily pattern, duration, functional impairment and psychosis boundary.
- Explain why each tempting alternative fails. Strong preparation requires recognizing the decisive cue and the boundary of each test or treatment.
A practical preparation plan
1. Map the full scope
Create a study tracker from the official clinical categories and cross-content areas. Keep the two sets of percentage ranges separate, and mark topics beyond this selective guide for additional study.
2. Build mechanism-to-decision links
For each concept, state the underlying mechanism, the discriminating finding and the resulting action. Contrast pairs such as Graves disease versus nonspecific anxiety, inflammatory arthritis versus osteoarthritis, and tuberculosis infection versus active disease.
3. Work calculations without answer choices
Calculate UACR, SAAG, ascitic neutrophils, pack-years and test-performance measures before reviewing options. Write units and denominators explicitly to expose common reasoning errors.
4. Complete and explain the question set
Answer the 20 drills independently, then explain every option in your own words. Record whether each error came from missing a cue, confusing mechanisms, mishandling units or applying the wrong population criteria.
5. Use flashcards for spaced decisions
Recall the answer and its brief rationale before turning each card. Revisit missed cards with their associated concept, then construct a new patient example that changes one decisive feature.
6. Broaden coverage through repeated study cycles
Return to the complete official outline after each study cycle and add practice in topics absent from these selected examples. Use a larger question resource for broader assessment; this guide's 20-question set cannot establish complete scope coverage or examination readiness.
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
- AOBIM: Written Exam
- AOBIM: Internal Medicine Certification Timeline
- Anaphylaxis: A 2023 Practice Parameter Update
- ACC Expert Consensus for Treatment of HFrEF: Key Points
- 2022 AHA/ACC/HFSA Heart Failure Guideline: Key Perspectives
- NIDDK: Graves’ Disease
- NIDDK: Diagnosis of Adrenal Insufficiency and Addison’s Disease
- NIDDK: Celiac Disease Tests
- AASLD: Why Timing Matters—Paracentesis on Admission for Cirrhosis with Ascites
- NHLBI: Iron-Deficiency Anemia
- CDC: Clinical and Laboratory Diagnosis for Tuberculosis
- CDC Laboratory Recommendations for Syphilis Testing, United States, 2024
- CDC: Syphilis—STI Treatment Guidelines
- Acute Hyperkalemia in the Emergency Department: KDIGO Conference Summary
- NIDDK: Assess Urine Albumin
- MedlinePlus: Myasthenia Gravis
- USPSTF: Lung Cancer Screening
- NHLBI: COPD Diagnosis
- GINA 2026 Summary Guide for Asthma Management and Prevention
- NIAMS: Rheumatoid Arthritis
- NIAMS: Osteoarthritis
- NIAMS: Gout—Diagnosis, Treatment, and Steps to Take
- CDC: Principles of Epidemiology, Lesson 5, Appendix A
- AOA: Tenets of Osteopathic Medicine
- AOA Guidelines for OMT for Patients With Low Back Pain
- AAD: What to Look For—ABCDEs of Melanoma
- NIH News in Health: What Is Menopause?
- National Eye Institute: Types of Glaucoma
- AAO-HNS: BPPV—Updated Best Practices for Diagnosis and Treatment
- NIMH: Bipolar Disorder
- KDIGO-2024-CKD-Guideline.pdf
- Myasthenia Gravis Tests: MedlinePlus Medical Test
- Spirometry Quick Guide - Global Initiative for Chronic Obstructive Lung Disease - GOLD
- Allopurinol: MedlinePlus Drug Information
- Menopause | Health
- DailyMed - JARDIANCE- empagliflozin tablet, film coated
- DailyMed - STEGLATRO- ertugliflozin tablet, film coated
- ferritin-guidelines-executivesummary.pdf
- Client Challenge
- Hyperthyroidism | American Thyroid Association
- Diagnosis of Pancreatitis - NIDDK
- Symptoms & Causes of GI Bleeding - NIDDK
- Recommendations | Spinal metastases and metastatic spinal cord compression | Guidance | NICE
- Pleural Disorders - Diagnosis | NHLBI, NIH
- KDIGO-2021-BP-Guideline.pdf
- AJG-Clinical-Guidelines-Highlights-Acute-Pancreatitis-2024-FINAL.pdf
- Polymyalgia Rheumatica and Giant Cell Arteritis | NIAMS
- Polymyalgia Rheumatica and Giant Cell Arteritis: Diagnosis, Treatment, and Steps to Take
- The role of dual energy computed tomography in the differentiation of acute gout flares and acute calcium pyrophosphate crystal arthritis - PMC
- JBJI - Guideline for management of septic arthritis in native joints (SANJO)
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.