Medical Licensing (MD/DO) · Independent exam preparation
DNB Final Examination (General Medicine): Clinical Reasoning Guide Study Guide
Practise diagnostic discrimination, emergency decisions and evidence interpretation across DNB General Medicine, with 60 concepts, 20 questions and 20 recall cards.
By CertMedbry · Updated 18 October 2026
Practise distinguishing competing diagnoses, interpreting investigations and choosing defensible next steps in adult internal medicine. These 60 selected concepts connect mechanisms with clinical decisions across every named curriculum domain. The official NBEMS General Medicine curriculum defines the full scope; this guide provides a selective foundation for further reading, written answers and bedside discussion. Dated clinical references support their stated criteria and established principles; historical references are used for enduring mechanisms and investigation interpretation.
Try 20 free practice questionsWhat is the exam format?
Check the question types, timing and outline before planning your revision.
Which qualification and preparation pathway does this guide cover?
This guide follows the post-MBBS DNB General Medicine training pathway leading to the NBEMS DNB Final Examination in that broad specialty. It is a postgraduate specialty exit examination. The issuer separately lists DrNB super-specialty examinations, NBEMS Diploma courses and admission examinations. The older curriculum bears the National Board of Examinations name; the June 2026 bulletin identifies the awarding body as the National Board of Examinations in Medical Sciences.
NBEMS Curriculum Index · DNB Final Examination June 2026 Information Bulletin
How many theory questions are there, and how long are the papers?
The June 2026 bulletin specifies four theory papers, each worth 100 marks with three hours allowed. Ordinarily, each paper contains ten short notes worth ten marks each: 40 short notes across four papers by calculation. The bulletin explicitly allows the number of short notes and their marks to vary in some subjects or papers.
What are the delivery format, item styles and scored or pretest arrangements?
The verified scheme describes written short-note theory papers at designated examination centres, followed by practical assessment. It does not describe an adaptive MCQ examination or a separate unscored pretest-item allocation. The 20 four-option questions here are independent knowledge drills; they do not reproduce the written examination or its practical stations.
What does the practical examination assess?
The practical examination carries 300 marks and comprises OSCE and/or clinical examination, and viva. Eligible candidates must first qualify in theory. A universal General Medicine station count or practical duration is not established by the supplied evidence. Prepare to demonstrate examination technique, interpretation, clinical reasoning, communication and safe management.
DNB Final Examination June 2026 Information Bulletin · Guidelines for Competency Based Training Programme in DNB General Medicine
How do the curriculum's four paper titles guide preparation?
The curriculum assigns Paper I to basic medical sciences, Paper II to principles and practice of medicine, Paper III to associated specialties, and Paper IV to recent advances in General Medicine. These titles support integrated preparation rather than isolated organ-system revision. The curriculum remains the full syllabus, including its smaller sections and practical competencies.
Guidelines for Competency Based Training Programme in DNB General Medicine
Are official domain percentages or an effective curriculum date available?
No numerical organ-system or domain weights are stated in the supplied official curriculum. Coverage here therefore balances breadth and clinical importance without claiming official percentages. The undated curriculum is linked from the official index outside the old-curriculum archive. The examination scheme cited is June 2026; the bulletin filename identifies 23.04.2026-V1, which is not a curriculum effective date. Applicability to a later December 2026 session has not been established.
NBEMS Curriculum Index · Guidelines for Competency Based Training Programme in DNB General Medicine · DNB Final Examination June 2026 Information Bulletin
What qualifying marks does the June 2026 bulletin specify?
The bulletin specifies at least 200/400 aggregate theory marks and at least 150/300 practical marks. It describes aggregate rounding and a theory grace provision for candidates in the specified 192–199 range; no practical grace provision applies. These administrative rules do not translate into a pass prediction from this guide's learning questions.
Does the bulletin include other routes to the same broad-specialty examination?
The bulletin includes eligibility provisions for DNB trainees and appropriately qualified MD/MS candidates applying in the same broad specialty. It also provides an only-practical application category for eligible candidates who have already qualified in theory. These categories do not establish a separate General Medicine syllabus. This guide consistently uses the post-MBBS DNB trainee pathway; session-specific eligibility should be read in the applicable bulletin.
An independent preparation resource for India's postgraduate DNB General Medicine broad-specialty exit examination, using the official curriculum and the June 2026 examination scheme.
Outline used: Undated DNB General Medicine curriculum currently linked from the opened official NBEMS curriculum index, read with the June 2026 DNB Final Examination Information Bulletin, whose filename identifies 23.04.2026-V1. No curriculum revision number or effective date was found. The workbook label maps to the DNB Final Examination in the General Medicine broad specialty; the assigned slug is preserved. Applicability of any later December 2026 bulletin was not verified.
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.
Basic Sciencesnot stated
1.How does ketone production cause metabolic acidosis?
Insufficient effective insulin permits increased fat breakdown and hepatic ketone production. Accumulating ketoacids consume bicarbonate, producing metabolic acidosis; the glucose concentration does not directly measure this acid burden. Blood beta-hydroxybutyrate, pH and bicarbonate therefore answer different questions from glucose. A patient can have clinically important ketoacidosis with relatively modest glucose, especially during SGLT2-inhibitor exposure. Interpret the biochemical pattern together rather than allowing one reassuring glucose result to dominate.
Apply it
A patient taking an SGLT2 inhibitor develops vomiting and deep breathing. Glucose is 178 mg/dL, bicarbonate 12 mmol/L and beta-hydroxybutyrate 5 mmol/L. Identify ketoacid accumulation as the explanation for the acidosis despite modest hyperglycaemia.
Common pitfall: Equating ketoacidosis with extreme hyperglycaemia misses euglycaemic presentations. A glucose measurement assesses glycaemia; it cannot establish whether ketone-associated acidosis is absent.
Hyperglycaemic Crises in Adults with Diabetes: A Consensus Report, 2024
Clinical Pharmacologynot stated
3.How is the fraction remaining calculated from drug half-life?
During first-order elimination, a constant fraction of drug is removed per unit time. After n half-lives, the fraction remaining is (1/2) raised to n. Three half-lives leave 12.5%, whereas four leave 6.25%. This calculation assumes the relevant elimination phase, unchanged clearance and no additional dosing. It estimates concentration decline under those assumptions; it does not establish that the remaining concentration is therapeutically ineffective or clinically harmless.
Apply it
A hypothetical drug has a six-hour elimination half-life and a concentration of 80 mg/L after distribution. With no further doses and unchanged first-order elimination, calculate the concentration 18 hours later: three half-lives leave 10 mg/L.
Common pitfall: Subtracting the same concentration every half-life incorrectly assumes zero-order elimination. Also distinguish percentage remaining from percentage eliminated when interpreting a concentration-time calculation.
4.How do clearance and distribution affect drug exposure differently?
Clearance describes elimination capacity, while an apparent distribution volume relates drug amount to plasma concentration under a specified model. In a one-compartment model with first-order elimination, half-life = 0.693 × Vd / clearance. For a multicompartment drug's terminal phase, terminal half-life = 0.693 × Vz / clearance, where Vz is the terminal apparent distribution volume. Vz is not interchangeable with steady-state distribution volume Vss. Linear kinetics alone does not make these volumes equivalent.
Apply it
Two hypothetical patients receive a one-compartment drug with the same Vd. If clearance in one is half that in the other, elimination half-life doubles. For a multicompartment drug, establish the relevant terminal Vz before applying the terminal half-life equation.
Common pitfall: Substituting Vss into the terminal half-life equation can give an incorrect result. A long terminal half-life can reflect tissue redistribution as well as elimination capacity.
5.Why can NSAIDs worsen established heart failure?
NSAIDs can promote sodium and water retention and impair renal haemodynamics through prostaglandin inhibition. These effects can increase congestion and blunt the response to heart-failure treatment. In HFrEF, the AHA/ACC/HFSA guideline identifies NSAIDs as harmful and advises avoiding or withdrawing them whenever possible. A medication review should include nonprescription analgesics because an apparently unrelated treatment can explain worsening oedema, weight gain or renal function.
Apply it
A patient with stable HFrEF develops ankle oedema and weight gain after starting an over-the-counter anti-inflammatory for knee pain. Identify the new NSAID as a plausible contributor and include it in the medication assessment.
Common pitfall: Escalating diuretics without reviewing new medicines may leave the precipitating factor in place. Nonprescription availability does not establish cardiovascular or renal safety in heart failure.
2022 AHA/ACC/HFSA Guideline for the Management of Heart Failure: Clinical Slide Set
Clinical Geneticsnot stated
6.What recurrence risk follows two autosomal-recessive carriers?
When both parents carry one pathogenic variant for the same autosomal-recessive condition, each pregnancy has a 25% probability of an affected child, a 50% probability of an unaffected carrier and a 25% probability of an unaffected noncarrier. These probabilities reset for each pregnancy because parental allele transmission is independent between conceptions. The calculation assumes the stated inheritance model and parental genotypes; it does not automatically apply to every familial disorder.
Apply it
A carrier couple already has one affected child and asks whether their next child is protected because the condition has already occurred. Explain that the next pregnancy still has a 25% affected-child probability under this model.
Common pitfall: Interpreting recurrence probabilities as a required pattern across four births is incorrect. A family can have several affected or unaffected children without contradicting independent Mendelian probabilities.
7.Why can mitochondrial disease vary within one family?
Mitochondrial DNA is usually transmitted through the mother. Heteroplasmy means that a cell or individual contains a mixture of mitochondrial DNA variants, including normal and disease-associated copies. Their proportions can differ between tissues and relatives, contributing to variation in manifestations and severity. A maternal pedigree can suggest mitochondrial inheritance, but predicting severity requires more than identifying the maternal line because tissue distribution and variant burden also matter.
Apply it
A mother and two adult children have a confirmed mitochondrial DNA disorder, but their neurological and muscular involvement differs. Use heteroplasmy and tissue distribution to explain why shared maternal inheritance need not produce identical clinical severity.
Common pitfall: Assuming maternal inheritance guarantees identical disease in every child overlooks heteroplasmy. Also distinguish mitochondrial DNA disorders from nuclear-gene disorders that affect mitochondrial function.
MedlinePlus Genetics: Mitochondrial DNA · MedlinePlus Genetics: Inheritance Risk Assessment
Cardiologynot stated
2.Which ECG findings distinguish atrial fibrillation from an irregular pulse alone?
Atrial fibrillation produces disorganised atrial activity, absent distinct repeating P waves and irregular R–R intervals when atrioventricular conduction is present. An irregular pulse prompts ECG assessment but can also reflect ectopic beats. Confirm the rhythm visually on an ECG tracing before making treatment decisions. The [2023 ACC/AHA/ACCP/HRS atrial fibrillation guideline](https://pmc.ncbi.nlm.nih.gov/articles/PMC11095842/) specifies these electrocardiographic characteristics and the need for visual confirmation.
Apply it
A stable adult with palpitations has narrow QRS complexes, irregularly irregular R–R intervals and no consistent P waves. Identify atrial fibrillation; assess symptoms, haemodynamic stability and thromboembolic risk rather than treating the pulse finding alone as a complete assessment.
Common pitfall: An irregular pulse or wearable alert does not establish atrial fibrillation without a confirmatory tracing. Regular atrial activity with occasional premature beats supports a different mechanism.
Guidelines for Competency Based Training Programme in DNB General Medicine
8.Which investigation characterises suspected valve disease?
Echocardiography evaluates valve structure, movement and the effects of valve disease on cardiac chambers. Doppler adds information about blood-flow direction and velocity, helping assess obstruction and regurgitation. A murmur identifies a reason for further assessment but does not alone quantify severity. Integrate symptoms, examination and echocardiographic findings because the clinical importance of a valve lesion depends on its haemodynamic consequences as well as its anatomical appearance.
Apply it
An adult with exertional dyspnoea has a newly detected systolic murmur. Select echocardiography with Doppler to assess valve anatomy and haemodynamics rather than relying on murmur loudness to determine the lesion's severity.
Common pitfall: A chest radiograph or ECG may show consequences of disease but cannot replace direct valve assessment. Murmur intensity alone is an unreliable measure of haemodynamic severity.
9.Why are SGLT2 inhibitors used in HFrEF without diabetes?
SGLT2 inhibitors are recommended in symptomatic chronic HFrEF to reduce heart-failure hospitalisation and cardiovascular mortality, irrespective of whether type 2 diabetes is present. Their heart-failure role therefore extends beyond glucose lowering. When considering therapy, distinguish the indication from its original therapeutic association with diabetes and assess the individual patient's suitability. Absence of diabetes is not, by itself, a reason to exclude an otherwise appropriate patient from this treatment class.
Apply it
A patient with symptomatic chronic HFrEF has no diabetes and asks why a diabetes-associated medicine is being discussed. Explain that the treatment's demonstrated heart-failure benefits apply independently of the presence of type 2 diabetes.
Common pitfall: Restricting SGLT2 inhibitors to patients with hyperglycaemia confuses one use with the full evidence-based indication. Suitability still requires assessment of individual contraindications and adverse-effect risks.
2022 AHA/ACC/HFSA Guideline for the Management of Heart Failure: Clinical Slide Set
10.When is an MRA appropriate in symptomatic HFrEF?
A mineralocorticoid receptor antagonist improves outcomes in appropriate patients with symptomatic HFrEF, but potassium retention creates an important safety boundary. The guideline recommends treatment when estimated GFR exceeds 30 mL/min/1.73 m² and serum potassium is below 5.0 mmol/L, with careful subsequent monitoring. Baseline eligibility is only the start: renal function and potassium can change during intercurrent illness, altered diuretic use or treatment interactions, requiring reassessment.
Apply it
A patient with symptomatic HFrEF has an estimated GFR of 46 mL/min/1.73 m² and potassium of 4.4 mmol/L. Recognise that these results meet the stated renal and potassium entry criteria, while planning ongoing safety monitoring.
Common pitfall: A normal pretreatment potassium result does not eliminate later hyperkalaemia risk. Avoid presenting MRA initiation as safe without considering renal function, interacting medicines and follow-up results.
2022 AHA/ACC/HFSA Guideline for the Management of Heart Failure: Clinical Slide Set
11.Why is a washout required before switching an ACE inhibitor to an ARNI?
Neprilysin inhibition and ACE inhibition both affect the breakdown of vasoactive peptides, including bradykinin. Combining their effects increases angioedema risk. Sacubitril/valsartan must therefore not be given concomitantly with an ACE inhibitor or within 36 hours of its last dose. The transition requires an explicit medication timeline, including the last administered dose, rather than merely replacing one name with another on a prescription list.
Apply it
A patient took an ACE inhibitor this morning and is being considered for sacubitril/valsartan. Establish the exact last-dose time and ensure the required 36-hour interval before the first ARNI dose rather than starting it immediately.
Common pitfall: Assuming an overnight gap is sufficient may leave less than the required interval. The concern is overlapping pharmacological effects and angioedema, not simply duplicate blood-pressure lowering.
2022 AHA/ACC/HFSA Guideline for the Management of Heart Failure: Clinical Slide Set
Neurologynot stated
12.Why is urgent brain imaging essential in suspected stroke?
Sudden focal neurological deficits can result from cerebral ischaemia or intracranial haemorrhage, and the immediate treatment implications differ. Urgent brain imaging evaluates for bleeding and other structural explanations before selecting stroke-specific treatment. Noncontrast CT is commonly used rapidly for this purpose. Clinical findings and onset time remain essential, but neither a typical vascular syndrome nor a high likelihood of ischaemia safely substitutes for assessment of intracranial bleeding.
Apply it
An adult develops abrupt aphasia and unilateral weakness. Record the last-known-well time and arrange urgent brain imaging to assess for haemorrhage before deciding on treatments that depend on the stroke being ischaemic.
Common pitfall: A clinically convincing stroke syndrome does not establish its pathological subtype. Also avoid treating a negative early CT as proof that cerebral ischaemia is absent.
13.Which weakness pattern suggests myasthenia and impending crisis?
Myasthenia gravis causes weakness through impaired neuromuscular transmission. Weakness commonly worsens with repeated activity and improves with rest, with ocular and bulbar muscles often involved. Respiratory muscle involvement can produce a life-threatening myasthenic crisis. Distinguish the diagnostic pattern of fatigability from the severity assessment: new swallowing difficulty, weak cough or breathing difficulty requires urgent assessment even when limb weakness appears relatively limited.
Apply it
A patient with fluctuating ptosis develops a weak voice, difficulty swallowing and increasing breathlessness. Recognise possible bulbar and respiratory involvement and prioritise urgent respiratory assessment rather than judging severity from the ability to walk.
Common pitfall: Mild limb weakness can coexist with dangerous bulbar or respiratory weakness. Do not interpret improvement after rest as evidence that a deteriorating respiratory presentation is benign.
Intensive Care Medicinenot stated
14.Which vasopressor is first-line in septic shock?
Septic shock involves circulatory dysfunction that may persist despite appropriate fluid assessment and resuscitation. Norepinephrine is the first-line vasopressor in adult septic shock because its predominant vasoconstrictor effect supports arterial pressure. Vasopressor use does not replace assessment of perfusion, infection treatment or source control. The clinical decision is to support circulation while repeatedly evaluating the underlying cause and response, rather than chasing a blood-pressure value in isolation.
Apply it
An adult with sepsis remains hypotensive after initial resuscitation and bedside reassessment. Identify norepinephrine as the first-line vasopressor while continuing evaluation of tissue perfusion, antimicrobial treatment and the need for source control.
Common pitfall: Choosing an inotrope merely because the patient is hypotensive overlooks the usual vasodilatory physiology. Additional vasoactive treatment depends on the haemodynamic problem and response to first-line therapy.
15.How does dynamic testing guide further fluid administration?
Fluid responsiveness means that increasing preload increases stroke volume or cardiac output. Dynamic assessment tests this relationship, for example by measuring the response to passive leg raising, which transiently shifts venous blood centrally. A static central venous pressure does not directly show whether another fluid bolus will improve flow. Responsiveness also differs from clinical need: a potential increase in output must be weighed against congestion and the patient's perfusion problem.
Apply it
A septic patient has already received fluid and now has uncertain volume tolerance. During passive leg raising, measured cardiac output does not increase. Use this finding to question further empiric boluses and reassess other causes of poor perfusion.
Common pitfall: Blood-pressure change alone is not equivalent to measured stroke-volume response. Even a positive dynamic test does not automatically justify fluid when harmful congestion is already present.
16.Why is predicted body weight used for protective ventilation?
In ARDS, a reduced amount of aerated lung receives the delivered tidal volume, making overdistension an important source of ventilator-associated injury. Protective ventilation uses low tidal volumes based on predicted body weight rather than actual weight because lung size relates more closely to height and sex than adipose mass. The commonly recommended target is approximately 6 mL/kg predicted body weight, alongside monitoring and limitation of plateau pressure.
Apply it
A patient with ARDS has a predicted body weight of 60 kg and an actual weight of 105 kg. Calculate an initial protective tidal-volume target of approximately 360 mL, then assess pressures, gas exchange and clinical response.
Common pitfall: Using actual weight in obesity can substantially overestimate an appropriate tidal volume. A low set volume also requires pressure monitoring and assessment of the delivered ventilation.
Respiratory Medicinenot stated
17.Which spirometry result supports persistent airflow obstruction in COPD?
GOLD uses a post-bronchodilator FEV1/FVC below 0.70 to confirm COPD-related airflow obstruction in a compatible clinical setting. Symptoms, relevant exposures and technically satisfactory testing remain necessary. Borderline or discordant results require repeat testing or further assessment; ratios between approximately 0.60 and 0.80 particularly warrant reassessment. An increase in FEV1 after bronchodilator does not exclude COPD if the ratio remains obstructed. These distinctions are explained in the [GOLD/GLI joint statement](https://doi.org/10.1183/13993003.02574-2025).
Apply it
A symptomatic smoker has pre-bronchodilator FEV1 1.20 L and FVC 2.50 L, giving 0.48. Afterwards, FEV1 is 1.50 L and FVC 2.70 L, giving 0.56. Airflow improves, but persistent post-bronchodilator obstruction remains. A post-bronchodilator ratio of 0.69 would require reassessment rather than an unqualified diagnosis from one test.
Common pitfall: Pre-bronchodilator obstruction alone does not establish the GOLD diagnostic criterion. The fixed ratio can also disagree with age-adjusted reference limits, particularly near the threshold.
18.How do Light's criteria classify a pleural effusion?
An effusion is classified as exudative if any Light criterion is met: pleural-to-serum protein ratio above 0.5, pleural-to-serum LDH ratio above 0.6, or pleural LDH above two-thirds the serum LDH upper reference limit. The criteria identify a biochemical pattern associated with local pleural disease, not a specific diagnosis. Use paired measurements where required and continue investigating the cause; diuretic-treated heart failure can sometimes produce misleading exudative classification.
Apply it
Pleural protein is 36 g/L and serum protein is 60 g/L in a patient with unilateral effusion. The ratio is 0.60, which meets an exudate criterion even before the LDH results become available.
Common pitfall: Requiring all three criteria misses exudates. Classification also does not establish malignancy or infection, and the clinical setting can justify reassessing an apparent biochemical exudate.
British Thoracic Society Guideline for Pleural Disease, 2023
19.When is drainage indicated for a parapneumonic effusion?
Frank pus establishes empyema and requires drainage alongside antibiotics. For nonpurulent pneumonia-associated fluid, a reliably measured pleural pH of 7.2 or lower indicates high risk of complicated pleural infection. Intercostal drainage is indicated when sufficient accessible fluid permits safe insertion. Intermediate pH results require integration of LDH, glucose, imaging and clinical progress. Uncertain accessibility requires procedural assessment, but an accessible collection with qualifying pH should not be managed by antibiotics alone while awaiting culture.
Apply it
A patient with pneumonia has sufficient fluid for safe ultrasound-guided drain insertion and pleural pH 7.10 from a correctly handled sample. Arrange intercostal drainage alongside antibiotics; the absence of visible pus does not remove the drainage indication.
Common pitfall: Waiting for a positive culture delays source control. Local anaesthetic or heparin contamination and delayed analysis can distort pH, so establish sample reliability when the result drives intervention.
British Thoracic Society Guideline for Pleural Disease, 2023
Nephrologynot stated
20.What changes establish acute kidney injury?
The established KDIGO AKI definition includes a creatinine increase of at least 0.3 mg/dL within 48 hours, an increase to at least 1.5 times baseline within seven days, or urine output below 0.5 mL/kg/hour for six hours. These routes capture different manifestations of acute dysfunction. Evaluate the trajectory, timing and urine output rather than relying on whether the current creatinine lies inside a laboratory reference interval.
Apply it
Creatinine rises from 0.7 to 1.1 mg/dL over 36 hours during an acute illness. Recognise AKI from the 0.4 mg/dL increase, even if the final concentration is not flagged as markedly abnormal by the laboratory.
Common pitfall: A reference-range creatinine does not exclude an important acute rise. Also avoid assigning acute injury from a single elevated value without establishing timing or other qualifying evidence.
KDIGO Clinical Practice Guideline for Acute Kidney Injury, 2012
21.How is AKI staged when creatinine and urine output disagree?
AKI severity is staged using creatinine and urine-output criteria, taking the more severe qualifying stage. Creatinine at 2.0–2.9 times baseline meets stage 2, while at least three times baseline meets stage 3. Initiation of renal replacement therapy also qualifies as stage 3. Urine-output thresholds incorporate both rate and duration, so a brief low measurement cannot be substituted for sustained oliguria. State the criterion that establishes the stage.
Apply it
Creatinine rises from 0.9 to 2.0 mg/dL within five days, while urine output remains above the oliguria thresholds. Calculate a 2.22-fold rise and classify stage 2 AKI using the creatinine criterion.
Common pitfall: Normal urine output does not cancel creatinine-defined AKI. Conversely, substantial sustained oliguria can establish a more severe stage than the creatinine rise alone would suggest.
KDIGO Clinical Practice Guideline for Acute Kidney Injury, 2012
22.How are chronicity, GFR and albuminuria combined in CKD?
CKD requires abnormalities of kidney structure or function present for at least three months with implications for health. Classification combines cause, GFR category and albuminuria category. An estimated GFR of 45–59 mL/min/1.73 m² is G3a; urine albumin-to-creatinine ratio of 30–300 mg/g is A2. Albuminuria adds prognostic information beyond GFR, while chronicity distinguishes established CKD from a transient abnormality or an acute process requiring separate evaluation.
Apply it
Estimated GFR remains 54 mL/min/1.73 m² and urine ACR remains 120 mg/g across four months. Describe the established functional and albuminuria categories as G3a A2, then investigate and document the underlying cause.
Common pitfall: One low estimated GFR does not establish chronicity. Also check ACR units: mg/g and mg/mmol use different numerical category boundaries and cannot be interchanged directly.
KDIGO 2024 Clinical Practice Guideline for Evaluation and Management of CKD
23.When is renal replacement therapy an emergency?
Emergency renal replacement therapy is considered when life-threatening disturbances of fluid, electrolytes or acid-base balance cannot be controlled adequately with medical treatment. Examples include refractory hyperkalaemia, severe refractory acidosis and pulmonary oedema causing dangerous respiratory compromise. The decision incorporates the whole clinical context and trends rather than a single urea or creatinine threshold. A modest creatinine elevation can coexist with an immediately dangerous complication, while a high value alone does not define urgency.
Apply it
A patient with AKI has persistent dangerous hyperkalaemia despite appropriate temporising treatment and ongoing reassessment. Recognise the uncontrolled life-threatening electrolyte disturbance as an indication for urgent renal replacement assessment rather than awaiting a higher creatinine.
Common pitfall: Using an isolated creatinine threshold delays treatment of physiological emergencies. Temporarily shifting potassium intracellularly also does not demonstrate that the total-body potassium problem has been resolved.
KDIGO Clinical Practice Guideline for Acute Kidney Injury, 2012
Endocrinology and Metabolismnot stated
24.What biochemical combination establishes DKA?
The 2024 consensus requires diabetes or qualifying hyperglycaemia, elevated ketones and metabolic acidosis for DKA. Relevant criteria include glucose at least 200 mg/dL or a prior history of diabetes, beta-hydroxybutyrate at least 3 mmol/L or significant urine ketones, and pH below 7.3 and/or bicarbonate below 18 mmol/L. A known diabetic patient can therefore meet DKA criteria despite glucose below 200 mg/dL. Direct blood ketone measurement helps identify the biochemical process.
Apply it
An adult with established diabetes has glucose 185 mg/dL, beta-hydroxybutyrate 4.6 mmol/L and venous pH 7.24. Identify DKA because known diabetes, substantial ketonaemia and acidosis satisfy the diagnostic combination despite the glucose concentration.
Common pitfall: A glucose below older familiar thresholds can falsely reassure. Ketosis without acidosis and acidosis without significant ketosis require different interpretations and should not automatically be labelled DKA.
Hyperglycaemic Crises in Adults with Diabetes: A Consensus Report, 2024
25.Which measurements establish resolution of DKA?
DKA resolution is defined by plasma ketones below 0.6 mmol/L together with venous pH at least 7.3 or bicarbonate at least 18 mmol/L; glucose should ideally also be below 200 mg/dL. Glucose often normalises before ketogenesis is fully suppressed. Urine ketones are unsuitable for judging resolution because changes between beta-hydroxybutyrate and acetoacetate can prolong positivity. The anion gap can also mislead when treatment-associated hyperchloraemic acidosis persists.
Apply it
During DKA treatment, glucose reaches 150 mg/dL but beta-hydroxybutyrate remains 2.2 mmol/L. Explain that biochemical resolution has not occurred and distinguish the improved glucose concentration from continued clinically important ketonaemia.
Common pitfall: Stopping DKA treatment solely because glucose normalises risks leaving ketogenesis untreated. Persistent urine ketones can also overstate ongoing disease after blood ketones and acid-base criteria have resolved.
Hyperglycaemic Crises in Adults with Diabetes: A Consensus Report, 2024
26.How does ACTH distinguish primary adrenal insufficiency?
Primary adrenal insufficiency reduces adrenal cortisol production, removing negative feedback and increasing pituitary ACTH secretion. In a patient with confirmed cortisol deficiency, ACTH more than twice the upper reference limit supports a primary adrenal cause. Interpret cortisol and ACTH together, considering sampling circumstances and exogenous glucocorticoid exposure. ACTH localises the defect within the hypothalamic-pituitary-adrenal system; a low cortisol concentration alone does not establish that the adrenal gland is the primary site.
Apply it
A patient has confirmed cortisol deficiency and ACTH markedly above twice the laboratory upper reference limit. Use the paired results to support primary adrenal insufficiency rather than attributing the low cortisol to an isolated pituitary defect.
Common pitfall: Reading ACTH without its paired cortisol and clinical context can mislocalise disease. Glucocorticoid treatment and acute illness can also complicate interpretation of endocrine testing.
27.When should suspected adrenal crisis be treated before confirmation?
Adrenal crisis is a medical emergency in which inadequate cortisol availability contributes to circulatory and metabolic instability. Severe compatible illness warrants immediate parenteral hydrocortisone and fluid resuscitation rather than waiting for confirmatory endocrine testing. Obtain cortisol and ACTH beforehand if doing so does not delay treatment. The diagnostic sequence must accommodate urgency: samples can preserve useful information, but the patient's instability determines whether treatment can safely await further investigation.
Apply it
A patient with possible adrenal insufficiency presents with vomiting, profound weakness and shock. Draw suitable endocrine samples immediately if feasible, but begin emergency glucocorticoid and fluid treatment without waiting for a stimulation test result.
Common pitfall: A desire for diagnostically pristine testing must not delay emergency treatment. Conversely, document administered glucocorticoids because they affect interpretation of subsequent hormone measurements.
Gastroenterology and Hepatologynot stated
28.What ascitic neutrophil count supports spontaneous bacterial peritonitis?
In an appropriate cirrhotic-ascites context, an ascitic polymorphonuclear neutrophil count of at least 250 cells/mm³ supports spontaneous bacterial peritonitis and treatment without waiting for culture positivity. Culture-negative neutrocytic ascites remains clinically significant. Calculate the absolute neutrophil count when only total cells and differential percentages are supplied. The diagnosis also requires attention to possible secondary intra-abdominal infection because the neutrophil threshold does not identify the infection's anatomical source.
Apply it
Ascitic fluid contains 600 white cells/mm³ with 50% neutrophils in a patient with cirrhosis and new abdominal discomfort. Calculate 300 neutrophils/mm³ and recognise that a negative initial culture would not remove the treatment indication.
Common pitfall: Using total ascitic leukocytes instead of absolute neutrophils misapplies the threshold. A negative culture also cannot exclude infection when qualifying neutrocytic ascites is present.
29.How should initial coeliac serology account for IgA?
Tissue-transglutaminase IgA is a preferred initial serological test for coeliac disease, but its interpretation depends on sufficient IgA production and ongoing gluten exposure. Measuring total IgA identifies deficiency that can make an IgA-based result falsely reassuring. In IgA deficiency, appropriate IgG-based testing is needed. A negative antibody result therefore has meaning only after considering the assay type, immunoglobulin status, diet and the remaining clinical probability of disease.
Apply it
A patient with chronic diarrhoea and iron deficiency has negative tissue-transglutaminase IgA but very low total IgA. Recognise the limitation of the result and select an appropriate IgG-based coeliac test rather than dismissing coeliac disease.
Common pitfall: Starting a gluten-free diet before diagnostic testing can reduce sensitivity. A negative IgA assay also cannot reliably exclude disease in someone who produces little IgA.
30.Why does a positive HLA result not diagnose coeliac disease?
HLA-DQ2 and HLA-DQ8 are susceptibility markers associated with coeliac disease, but many people carrying them never develop the condition. A positive result therefore has limited confirmatory value. Absence of these susceptibility types makes coeliac disease very unlikely and can help resolve selected diagnostic uncertainties. Distinguish inherited susceptibility from evidence of active immune-mediated intestinal disease; the latter requires integration of symptoms, serology and, when indicated, small-intestinal biopsy findings.
Apply it
An asymptomatic adult is worried after a commercial test reports HLA-DQ2. Explain that the result establishes susceptibility rather than a diagnosis, and that starting lifelong dietary treatment cannot be justified by the genotype alone.
Common pitfall: A strong genetic association is not the same as a high positive predictive value. Common susceptibility alleles can be useful for exclusion while remaining weak confirmatory evidence.
31.How does hepatitis B serology distinguish vaccination from past infection?
The hepatitis B triple panel measures HBsAg, anti-HBs and total anti-HBc. Vaccination produces surface antibody without core antibody, whereas resolved natural infection generally produces both anti-HBs and anti-HBc with negative HBsAg. Core antibody reflects exposure to the virus rather than vaccination alone. Interpret the complete pattern because isolated markers can be misleading, and HBsAg negativity alone does not distinguish susceptibility, vaccine immunity and resolved infection.
Apply it
A patient's HBsAg is negative, anti-HBs positive and total anti-HBc positive. Explain that the combination supports resolved natural infection rather than immunity generated solely by hepatitis B vaccination in an otherwise comparable setting.
Common pitfall: Calling every positive anti-HBs result vaccine immunity ignores core antibody. Isolated anti-HBc has several possible interpretations and should not be treated as the same straightforward pattern.
Hematology and Oncologynot stated
32.When does methylmalonic acid help assess vitamin B12 status?
Vitamin B12 is required for metabolism of methylmalonyl-CoA, so deficiency can increase methylmalonic acid. MMA can help clarify a borderline serum B12 result when the clinical picture remains suggestive. However, reduced kidney function can independently elevate MMA, limiting specificity. Interpret the biochemical marker alongside renal function, symptoms and the blood count. A raised result is evidence to integrate, rather than an isolated diagnosis that overrides important competing explanations.
Apply it
A patient has sensory symptoms and a borderline serum B12 concentration. Consider MMA to assess functional deficiency, but first note that advanced kidney impairment would make an elevated MMA result less specific for B12 deficiency.
Common pitfall: An elevated MMA is not uniquely caused by B12 deficiency. Renal impairment and the overall clinical pattern matter, particularly when the serum B12 result is equivocal.
NIH Office of Dietary Supplements: Vitamin B12—Health Professional Fact Sheet
33.When does illness after anticancer treatment require immediate treatment for neutropenic sepsis?
NICE defines neutropenic sepsis during anticancer treatment as neutrophils at or below 0.5 × 10⁹/L with temperature above 38°C or other evidence of clinically significant sepsis. Suspected neutropenic sepsis is an emergency requiring immediate empirical antibiotics. Obtain cultures and assess organ function without delaying treatment. The absence of a localising infection does not justify observation alone. See [NICE CG151](https://www.nice.org.uk/guidance/cg151/chapter/recommendations).
Apply it
Seven days after chemotherapy, a patient has temperature 38.5°C and neutrophils 0.3 × 10⁹/L. Start emergency assessment and immediate empirical antibiotics; collect cultures promptly rather than waiting for an organism or obvious source.
Common pitfall: Severe infection can occur without fever, so an unwell patient receiving anticancer treatment still needs urgent assessment. Do not postpone antibiotics until neutropenia or culture results return when the syndrome is strongly suspected.
Guidelines for Competency Based Training Programme in DNB General Medicine
Immune Mediated Inflammatory and Rheumatological Disordersnot stated
34.Which evidence distinguishes gout from incidental hyperuricaemia?
Gout results from monosodium urate crystal deposition and the inflammatory response it provokes. Direct diagnostic evidence is identification of needle-shaped monosodium urate crystals with strong negative birefringence under compensated polarised microscopy. Calcium pyrophosphate crystals are typically rhomboid and weakly positively birefringent, distinguishing calcium pyrophosphate arthritis from gout. Serum urate alone neither proves gout nor reliably excludes an acute attack. The central distinction is between a biochemical risk factor and demonstrated crystal deposition in the affected joint. A hot swollen joint also requires assessment for infection, which can coexist with crystal arthritis.
Apply it
A patient with an acutely swollen knee has serum urate within the laboratory range. Aspiration identifies needle-shaped, strongly negatively birefringent crystals, supporting gout despite the serum result. Typically rhomboid, weakly positively birefringent crystals would instead support calcium pyrophosphate arthritis. Include synovial-fluid microbiological testing when evaluating possible joint infection.
Common pitfall: Attributing every painful joint in a hyperuricaemic patient to gout risks missing infection or another arthritis. Describe both crystal shape and birefringence rather than reporting only that crystals are present. Finding urate crystals does not exclude concurrent septic arthritis.
35.Which findings suggest kidney involvement in systemic lupus erythematosus?
Lupus nephritis results from autoimmune injury to the kidneys and can cause proteinuria, haematuria, oedema, hypertension and impaired filtration. Urine protein testing and blood tests assess involvement; kidney biopsy confirms and characterises the injury when indicated, helping determine treatment. Renal disease can develop without dramatic urinary symptoms, so systemic symptom improvement does not establish renal remission. See [NIDDK: Lupus and Kidney Disease](https://www.niddk.nih.gov/health-information/kidney-disease/lupus-nephritis).
Apply it
A patient with SLE develops new proteinuria and microscopic haematuria despite improved joint pain. Quantify urinary protein, assess renal function and blood pressure, and arrange specialist evaluation for possible lupus nephritis and biopsy.
Common pitfall: A normal creatinine does not exclude clinically important urinary abnormalities. A lupus diagnosis also does not make every renal abnormality autoimmune; assess competing causes before selecting immunosuppression.
Guidelines for Competency Based Training Programme in DNB General Medicine
Infectious Diseasesnot stated
36.Why are thick and thin blood films complementary in malaria?
Thick blood films concentrate blood elements and improve detection when parasite density is low. Thin films preserve red-cell and parasite morphology, supporting species identification and estimation of parasitaemia. The two preparations therefore answer complementary questions rather than competing as interchangeable tests. Prompt microscopy is important in a compatible febrile traveller because identifying infection, species and parasite burden contributes directly to assessment of severity and appropriate management.
Apply it
A recently returned traveller has fever and suspected malaria. Request urgent thick and thin blood films so that the laboratory can maximise parasite detection while also evaluating species and the proportion of infected red cells.
Common pitfall: Requesting only a thin film can reduce sensitivity at low parasite density. A positive rapid antigen test also does not supply every detail provided by properly interpreted microscopy.
37.When should malaria microscopy be repeated after a negative film?
A single negative blood film does not exclude malaria when clinical suspicion remains high, particularly early in infection or with low parasitaemia. CDC guidance recommends repeating blood smears every 12–24 hours for a total of three sets before ruling out malaria in this situation. Do not delay initial testing until a fever spike. The decision to repeat follows exposure history and clinical probability rather than assuming one negative sample has perfect sensitivity.
Apply it
A traveller from a malaria-endemic region has fever and thrombocytopenia, but the first smear is negative. Maintain the differential and arrange repeat microscopy at the recommended intervals rather than discharging the diagnosis after one sample.
Common pitfall: Waiting for fever periodicity delays assessment, and a negative rapid test does not replace the repeat-microscopy strategy when suspicion remains high. Consider alternative diagnoses in parallel.
38.Why can dengue worsen as the fever settles?
The dengue critical phase often begins around defervescence, when increased capillary permeability can cause plasma leakage. A rising haematocrit, narrowing pulse pressure and worsening perfusion can therefore indicate deterioration despite a lower temperature. The clinical problem is loss of effective circulating plasma volume rather than fever itself. Interpret trends in symptoms, haemodynamics, haematocrit and fluid balance together, because defervescence does not reliably identify recovery.
Apply it
On day five of dengue illness, fever settles but haematocrit rises and pulse pressure narrows. Recognise a possible plasma-leakage phase and reassess circulation urgently rather than interpreting the temperature improvement as adequate evidence of recovery.
Common pitfall: A falling temperature can falsely reassure during dengue. Platelet count alone does not describe circulatory status or replace assessment for leakage, bleeding and organ involvement.
CDC: Clinical Features of Dengue · CDC: Clinical Care of Dengue
39.How should negative sputum microscopy affect investigation of suspected pulmonary tuberculosis?
Negative acid-fast smears do not exclude pulmonary tuberculosis, and a positive smear does not uniquely identify M. tuberculosis. Nucleic acid amplification can rapidly identify M. tuberculosis complex; culture remains necessary for confirmation and susceptibility assessment. CDC recommends molecular testing on at least one respiratory specimen when suspected pulmonary TB and the result would change management or control measures. See [CDC clinical and laboratory diagnosis](https://www.cdc.gov/tb/hcp/testing-diagnosis/clinical-and-laboratory-diagnosis.html).
Apply it
An adult with persistent cough, weight loss and suggestive chest imaging has negative initial sputum microscopy. Continue appropriate airborne precautions and obtain molecular testing and mycobacterial cultures rather than using the smear to exclude TB.
Common pitfall: A TB blood test or skin test cannot by itself distinguish active disease from infection without disease. Molecular testing complements rather than replaces culture and susceptibility testing.
Guidelines for Competency Based Training Programme in DNB General Medicine
Dermatologynot stated
40.Which blister pattern suggests pemphigus vulgaris?
Pemphigus vulgaris involves autoantibodies against desmogleins, disrupting adhesion between epidermal cells. The resulting intraepidermal split produces fragile blisters that rupture into erosions, and painful oral involvement is common. Desmoglein 3 is particularly associated with mucosal disease; desmoglein 1 involvement can accompany skin disease. Morphology and distribution guide the differential, but antibody findings and appropriate tissue assessment must be interpreted together rather than using one clinical sign as definitive proof.
Apply it
An adult has persistent painful oral erosions and easily ruptured skin blisters. Use the mucosal involvement and fragile blister roof to prioritise pemphigus vulgaris and select investigations directed at the relevant autoimmune blistering process.
Common pitfall: Assuming every autoimmune blistering disorder causes tense blisters misses the importance of split level. Oral erosions may dominate before conspicuous intact skin blisters are seen.
Mayo Clinic Laboratories: Desmoglein 1 and Desmoglein 3, IgG Antibodies · British Association of Dermatologists: Pemphigus Vulgaris, July 2022
41.Why are bullous pemphigoid blisters typically tense?
Bullous pemphigoid targets proteins associated with epidermal attachment at the basement-membrane region, particularly BP180 and BP230. Separation below the epidermis leaves a relatively robust blister roof, producing tense blisters, often with marked itch. This contrasts with the fragile intraepidermal blisters of pemphigus. The morphological distinction is mechanistically useful, but clinical appearance should be integrated with appropriate immunological and tissue findings because other disorders can also produce subepidermal blisters.
Apply it
An older adult develops intensely itchy plaques followed by tense blisters, with little mucosal disease. Relate the robust blister roof to a subepidermal split and prioritise bullous pemphigoid in the diagnostic assessment.
Common pitfall: Age and itch support the pattern but are not diagnostic. Antigen location, split level and tissue findings must agree; antibody results alone cannot resolve a discordant presentation.
Mayo Clinic Laboratories: Bullous Pemphigoid, BP180 and BP230, IgG Antibodies · British Association of Dermatologists Guidelines for the Management of Bullous Pemphigoid, 2012
Geriatric Medicinenot stated
42.What distinguishes delirium from a stable chronic cognitive disorder?
Delirium is an acute, fluctuating disturbance involving attention and awareness, often triggered by illness, medicines, pain or environmental disruption. Establishing the patient's baseline and the time course is essential because pre-existing dementia does not prevent superimposed delirium. Quietness or drowsiness can be a presentation, so agitation is not required. The practical implication is to investigate reversible precipitants rather than attributing every cognitive change in an older patient to chronic decline.
Apply it
An older inpatient who was conversational yesterday becomes inattentive and intermittently drowsy today. Obtain collateral baseline information and assess acute precipitants, including illness and medicines, rather than assuming the change simply represents longstanding dementia.
Common pitfall: Hypoactive delirium is easily missed because it disrupts the ward less visibly. Chronic cognitive impairment also increases vulnerability and does not explain away an abrupt deterioration.
Cambridge University Hospitals: Delirium in Adult Critical Care
43.How should a geriatric medication review identify preventable harm?
A geriatric medication review connects every medicine to its indication, benefit, adverse effects and the patient's current function. Reduced physiological reserve and changes in drug handling increase vulnerability to polypharmacy and iatrogenic illness. Include prescribed, nonprescription and recently stopped medicines, then relate timing to falls, confusion, hypotension or declining independence. For example, an NSAID can cause fluid retention or renal deterioration, while sedative exposure can impair consciousness. Review the suspected mechanism rather than stopping medicines solely because the list is long.
Apply it
An older adult develops recurrent falls after several medication changes. Reconstruct the full medicine timeline and assess symptoms, blood pressure, renal function and daily activities to identify plausible drug-related contributors and medicines whose indications need review.
Common pitfall: Counting medicines alone does not identify which treatment is harmful or beneficial. Removing a useful medicine without reviewing its indication can be as problematic as overlooking an adverse effect.
Guidelines for Competency Based Training Programme in DNB General Medicine · 2022 AHA/ACC/HFSA Guideline for the Management of Heart Failure: Clinical Slide Set · The ABCDE Approach | Resuscitation Council UK
Palliative Carenot stated
44.When should palliative care begin during serious illness?
Palliative care aims to prevent and relieve suffering through early identification, assessment and treatment of physical, psychosocial and spiritual problems. It can accompany disease-directed treatment and is relevant before the final days of life. The trigger is unmet need associated with serious illness, rather than exhaustion of every treatment option. Early involvement creates time to assess symptoms, support families and align care with the person's priorities while other appropriate treatments continue.
Apply it
A patient receiving active treatment for advanced cancer has persistent pain, insomnia and family distress. Introduce palliative support alongside oncology care rather than postponing symptom and psychosocial assessment until disease-directed treatment has ended.
Common pitfall: Equating palliative care with imminent death delays useful support. Its inclusion also does not, by itself, establish a decision to withhold any particular disease-directed treatment.
45.How does multidimensional assessment improve symptom care?
Serious-illness suffering can reflect interacting physical symptoms, emotional distress, social pressures and spiritual concerns. A multidimensional assessment asks how these components affect the person's experience and priorities rather than assuming symptom intensity is explained entirely by tissue pathology. This does not make physical symptoms less real; it identifies additional treatable sources of burden. Team-based support can then address needs that analgesic adjustment alone would leave unresolved.
Apply it
A patient with advanced organ failure reports worsening distress despite improved pain control. Explore breathlessness, anxiety, caregiver strain, financial concerns and personal meaning to identify why the overall burden remains high and what additional support is needed.
Common pitfall: Calling distress psychological can dismiss physical disease, while escalating analgesia alone may miss other needs. Assessment should integrate dimensions without using one to invalidate another.
Allergy and Immunologynot stated
46.How is anaphylaxis recognised and treated when skin findings are absent?
Anaphylaxis is highly likely when hypotension, bronchospasm or laryngeal involvement develops rapidly, within minutes to several hours, after exposure to a known or highly probable allergen for that patient, even without skin findings. The isolated-bronchospasm criterion excludes lower-respiratory symptoms triggered by common inhalant allergens or attributed to perceived inhalational food exposure without ingestion. These exclusions prevent isolated allergic asthma from being misclassified as anaphylaxis. Give intramuscular adrenaline promptly into the anterolateral thigh, summon emergency help, and support airway, breathing and circulation. Reassess and repeat adrenaline when required. Antihistamines cannot replace adrenaline for respiratory or circulatory compromise. See [WAO anaphylaxis guidance, Table 2](https://pmc.ncbi.nlm.nih.gov/articles/PMC7607509/).
Apply it
Minutes after an antibiotic, an adult develops wheeze, a hoarse voice and hypotension without a rash. The rapid association with the antibiotic and combined respiratory and circulatory compromise indicate anaphylaxis. Give immediate intramuscular adrenaline, stop the antibiotic exposure, summon resuscitation help and provide airway support, oxygen and intravenous crystalloid for hypotension. A hoarse voice suggests laryngeal involvement and requires urgent airway assessment.
Common pitfall: Do not wait for urticaria or laboratory confirmation before treating this antibiotic-associated emergency. Conversely, isolated wheeze after pollen exposure does not satisfy the isolated-bronchospasm criterion. Initial intravenous adrenaline boluses carry substantial risk and are not the routine first-line route.
Adolescent Healthnot stated
47.Which developmental findings warrant assessment for delayed puberty?
Absent breast development by 13 years or absent testicular enlargement to at least 4 mL or 2.5 cm in length by 14 years warrants assessment. Review growth velocity, nutrition, chronic illness and family maturation history; obtain bone age and appropriate early-morning gonadotropin and sex-steroid measurements. Delayed bone age can support constitutional delay but is not diagnostic. High LH/FSH with low sex steroids suggests primary gonadal failure; low or inappropriately normal LH/FSH leaves constitutional, functional and central causes to distinguish.
Apply it
A 14-year-old boy has testes below 4 mL, delayed bone age and a family history of late puberty. Assess for constitutional delay while checking growth trajectory and chronic disease. Markedly elevated gonadotropins would redirect the assessment towards gonadal failure.
Common pitfall: Pubic hair reflects adrenarche and does not establish gonadal puberty. Low gonadotropins alone cannot distinguish constitutional delay from persistent central hypogonadism; CNS symptoms require urgent assessment.
Child with Suspected Delayed Puberty - Pediatric Endocrine Society
Psychiatry Disordernot stated
48.When do symptoms after reducing alcohol suggest withdrawal requiring monitored treatment?
Abrupt reduction after prolonged heavy alcohol use can cause withdrawal with tremor, sweating, tachycardia, anxiety, insomnia and agitation. Hallucinations, seizures or fluctuating confusion indicate greater urgency. Establish previous withdrawal seizures or delirium, comorbidity and social support. NICE recommends admission for current or high risk of seizures or delirium tremens; symptom-triggered medication requires continuous access to assessment and monitoring. Assess nutrition and Wernicke risk, providing thiamine prophylaxis or parenteral treatment when indicated.
Apply it
A dependent drinker develops tremor, sweating and tachycardia after sharply reducing intake and has a previous withdrawal seizure. Arrange hospital-based medically assisted withdrawal with monitoring, assess alternative causes and provide appropriate thiamine.
Common pitfall: Labelling the presentation primary anxiety misses withdrawal. CIWA-Ar supports clinical judgement rather than replacing it; suspected Wernicke encephalopathy requires parenteral thiamine, and phenytoin is not recommended for alcohol-withdrawal seizures.
Poisoning, Drug Overdose and Envenomationnot stated
49.How does suspected opioid toxicity change the initial poisoning response?
Establish agent, formulation, amount, timing, route and co-ingestants while assessing physiology. Depressed consciousness with slow or inadequate breathing suggests opioid toxicity; small pupils support the pattern but are not obligatory. Open and support the airway, provide assisted ventilation when needed and administer naloxone appropriately. Titrate reversal towards adequate ventilation and reassess because toxicity can recur after naloxone wears off. An antidote does not replace respiratory support.
Apply it
An unresponsive adult has a pulse, respiratory rate of six per minute and suspected opioid exposure. Call for help, open the airway, assist ventilation and give naloxone while checking glucose and considering co-ingestants.
Common pitfall: Supplemental oxygen can preserve saturation despite dangerous hypoventilation and hypercapnia. Do not wait for a complete exposure history or toxicology result before supporting ventilation.
Disorders Associated with Environmental Exposurenot stated
50.What action follows altered mental status after significant heat exposure?
Heat exposure with confusion, seizures or reduced consciousness warrants emergency assessment for suspected heat stroke and immediate rapid active cooling. Move the patient from heat, remove excess clothing and begin effective cooling, such as cold-water immersion when feasible with airway protection, or wetting the skin with vigorous air circulation. Assess airway, circulation and temperature while evaluating competing causes. Do not defer cooling for a complete history or investigations. See [CDC heat-illness guidance](https://www.cdc.gov/niosh/heat-stress/about/illnesses.html).
Apply it
An adult becomes confused after prolonged outdoor work in hot conditions. Activate emergency care and start rapid cooling during physiological assessment; obtain exposure history, glucose and further investigations in parallel.
Common pitfall: Profuse sweating does not exclude heat stroke. A temperature measured after cooling may underestimate the earlier severity, and oral fluids are unsafe in a patient with impaired consciousness.
Nuclear Medicinenot stated
51.How is a reversible myocardial perfusion defect interpreted?
Compare stress and rest tracer distribution using a defined protocol, such as technetium-99m sestamibi SPECT. A defect during stress that improves at rest supports inducible ischaemia. A persistent defect may reflect scar, viable dysfunctional myocardium or artefact; it does not automatically prove irreversible injury. Review image quality and attenuation before attributing an abnormality to coronary disease. See the [SNM myocardial perfusion procedure guideline](https://tech.snmjournals.org/content/36/3/155).
Apply it
Adequate stress imaging shows reduced anterior-wall uptake that normalises at rest. After checking for artefact, interpret inducible ischaemia and use its extent, symptoms and ventricular findings to guide cardiology assessment.
Common pitfall: Breast or diaphragmatic attenuation can mimic a defect. Perfusion imaging assesses functional tracer distribution and does not by itself specify coronary stenosis severity or mandate revascularisation.
Guidelines for Competency Based Training Programme in DNB General Medicine
52.How can a diuretic renogram distinguish a dilated collecting system from obstruction?
Technetium-99m MAG3 is predominantly extracted by proximal tubular secretion; dynamic imaging with furosemide assesses drainage. Collecting-system washout half-time below ten minutes argues against obstruction. A prolonged half-time alone does not establish obstruction: renal impairment, hydration, bladder filling and pelvic retention affect washout. Integrate postvoid images and relative function. See the [SNMMI/EANM adult diuretic renography guideline](https://pmc.ncbi.nlm.nih.gov/articles/PMC6020824/).
Apply it
A dilated kidney has a washout half-time of 18 minutes, but the postvoid-to-maximum count ratio is 0.10. Approximately 90% has drained, strongly arguing against obstruction. Avoid diagnosing obstruction or recommending decompression from the half-time alone.
Common pitfall: Hydronephrosis is an anatomical finding, not proof of functional obstruction. Poor renal function can cause delayed tracer clearance even without obstruction.
Guidelines for Competency Based Training Programme in DNB General Medicine
Regenerative Medicinenot stated
53.How do autologous and allogeneic stem-cell approaches differ?
Autologous haematopoietic stem-cell transplantation uses the patient's own cells, whereas allogeneic transplantation uses another person's cells. Allogeneic transplantation introduces donor compatibility and graft-versus-host disease considerations: donor immune cells can injure recipient tissues. Autologous transplantation avoids this donor-derived mechanism, but conditioning toxicity and infection risks remain. Stem-cell self-renewal and differentiation support restoration of blood-cell production; the cell source and disease indication determine the relevant benefit and risk assessment.
Apply it
A learner describes every stem-cell procedure as donor transplantation. Identify whether cells are autologous or allogeneic, then connect the source to donor compatibility and graft-versus-host disease rather than applying those risks uniformly.
Common pitfall: Autologous transplantation is not risk-free. Established haematopoietic transplantation also does not establish benefit for unrelated commercial regenerative interventions.
Guidelines for Competency Based Training Programme in DNB General Medicine
Pregnancy-related Medical Disordersnot stated
54.How do chronic hypertension, gestational hypertension and pre-eclampsia differ?
Under NICE NG133, chronic hypertension predates pregnancy, is present before 20 weeks or is already treated at maternity referral. Gestational hypertension begins after 20 weeks without significant proteinuria. Pre-eclampsia is new hypertension after 20 weeks with proteinuria, maternal organ dysfunction or uteroplacental dysfunction. Proteinuria is not obligatory when qualifying organ dysfunction is present. Significant proteinuria includes urine protein:creatinine ratio at least 30 mg/mmol. Severe hypertension around 160 systolic or 110 diastolic, neurological symptoms or deteriorating organ function requires urgent escalation.
Apply it
At 30 weeks, a previously normotensive patient has BP 166/112 mmHg, severe headache and falling platelets, despite absent proteinuria. Suspect pre-eclampsia with severe features and arrange urgent obstetric assessment, monitored antihypertensive treatment and assessment for magnesium sulfate and birth planning.
Common pitfall: Absent proteinuria does not exclude pre-eclampsia. Labetalol, nifedipine or methyldopa may be used according to suitability; ACE inhibitors and ARBs require replacement during pregnancy.
Recommendations | Hypertension in pregnancy: diagnosis and management | Guidance | NICE
Critical Care and Emergency Medicinenot stated
55.What is the initial sequence when assessing a comatose patient?
Assess and support airway, ventilation and circulation immediately, treating threats as they are found. Measure glucose promptly and treat hypoglycaemia; use venous or arterial glucose when peripheral measurements may be unreliable. Examine pupil size, symmetry and light responses, document conscious level and review sedatives or analgesics, including possible opioid toxicity requiring naloxone. Then pursue investigations directed by examination and context, such as blood gases, electrolytes or urgent brain imaging. Reassess after each intervention.
Apply it
An unresponsive patient arrives without a history. Support inadequate breathing and circulation, obtain glucose immediately and correct hypoglycaemia. Examine pupils and review possible opioid or sedative exposure while arranging investigations guided by the remaining findings.
Common pitfall: Do not send an unstable patient for imaging before treating immediate physiological threats. A normal oxygen saturation on supplemental oxygen does not exclude hypercapnia, and a coma score does not identify the cause.
Nutrition and Metabolismnot stated
56.How should feeding begin in a ventilated adult who cannot eat?
If oral intake is impossible and the gastrointestinal tract is usable, ESPEN recommends enteral nutrition within 48 hours, usually by continuous gastric feeding. Defer enteral feeding during uncontrolled shock, suspected bowel ischaemia or obstruction, or uncontrolled life-threatening respiratory or metabolic instability. Start cautiously and increase delivery progressively. In patients at high refeeding risk, give thiamine immediately before feeding and continue supplementation because carbohydrate metabolism increases thiamine requirements. NICE CG32 recommendation 1.4.8 specifies oral thiamine 200–300 mg daily immediately before and during the first 10 days of feeding, with a full-dose daily intravenous vitamin B preparation when necessary. Provide accompanying vitamin supplementation, assess fluid balance, and closely monitor and replace phosphate, potassium and magnesium.
Apply it
A stabilised ventilated adult has had negligible intake for 12 days and has no bowel contraindication. This duration of poor intake meets a NICE high-risk criterion. Give thiamine immediately before starting cautious enteral nutrition and continue it during the first 10 days. NICE recommends starting high-risk patients at no more than 10 kcal/kg/day and increasing slowly toward full needs over 4–7 days. Assess circulatory volume and fluid balance, measure phosphate, potassium and magnesium at baseline and daily initially, and replace deficits while reassessing progression.
Common pitfall: Mechanical ventilation and absent bowel sounds alone do not contraindicate enteral nutrition. Uncontrolled shock does. Gradual calorie advancement and electrolyte replacement do not substitute for thiamine before feeding. Immediate full-target feeding can aggravate refeeding disturbances, while excessive fluid delivery can worsen fluid overload.
ESPEN_practical_and_partially_revised_guideline_Clinical_nutrition_in_the_intensive_care_unit.pdf · Recommendations | Nutrition support for adults: oral nutrition support, enteral tube feeding and parenteral nutrition | Guidance | NICE
Biostatistics, Research Methodology and Clinical Epidemiologynot stated
57.How does a research question determine the study design?
A research protocol should connect the question, participants, intervention or exposure, outcomes and design. A cohort follows exposure groups for outcomes; a case-control study starts with outcome status and examines prior exposure; a diagnostic-accuracy study compares an index test with a reference standard. Choose a feasible, ethical design that addresses the question. Define the primary outcome and its measurement before collecting data so that analysis addresses the stated objective rather than a convenient finding discovered afterwards.
Apply it
A proposed thesis asks whether a new test identifies a defined disease against a reference standard. Frame it as a diagnostic-accuracy question, specify eligible participants and both assessments, and define the accuracy outcomes before data collection begins.
Common pitfall: A study title does not establish a coherent method. Changing the principal outcome after inspecting results can disconnect the reported conclusion from the original research question.
Guidelines for Competency Based Training Programme in DNB General Medicine
58.How are sensitivity, specificity and predictive values calculated from a two-by-two table?
Consider 100 people with disease: 90 test positive and 10 negative. Among 900 without disease, 90 test positive and 810 negative. Sensitivity = true positives/all with disease = 90/100 = 90%. Specificity = true negatives/all without disease = 810/900 = 90%. Positive predictive value = 90/180 = 50%; negative predictive value = 810/820 = 98.8%. These are hypothetical calculations. Predictive values depend on prevalence: with unchanged sensitivity and specificity, lower prevalence reduces positive predictive value.
Apply it
At 1% prevalence in 10,000 people, the same 90%-sensitive, 90%-specific test gives 90 true positives and 990 false positives. Positive predictive value becomes 90/1,080 = 8.3%. A positive result therefore needs interpretation against the clinical probability and an appropriate confirmatory strategy.
Common pitfall: Sensitivity uses everyone with disease as its denominator; positive predictive value uses everyone testing positive. They are not interchangeable. Estimates can also change with patient spectrum, verification methods and the reference standard.
Guidelines for Competency Based Training Programme in DNB General Medicine
Ethics, Medicolegal Aspects and Health Policynot stated
59.What makes consent a clinical process rather than a signature?
A meaningful consent process explains the proposed intervention, its purpose, important risks and alternatives in language the patient can understand, then addresses questions and the person's voluntary decision. Documentation records that process rather than creating understanding by itself. Assess whether the patient can understand and weigh the relevant information for the decision. Applicable legal requirements depend on context and jurisdiction, so a signed form should never substitute for patient-centred explanation.
Apply it
A patient has signed a procedure form but cannot explain what is planned. Pause the consent process to clarify the purpose, material risks and alternatives, assess understanding and document the discussion before treating the signature as sufficient authorisation.
Common pitfall: A signature does not prove understanding or voluntariness. Conversely, good verbal communication should still be accompanied by the documentation required for the intervention and local legal context.
Guidelines for Competency Based Training Programme in DNB General Medicine
60.Why must research approval and confidentiality precede data collection?
Ethics committee approval must precede research initiation. Prospective review assesses participant risks, consent arrangements and the scientific justification before exposure to study procedures. Define data access, storage and handling of identifiable information in the protocol. Ethical review is not retrospective endorsement, and scientific usefulness does not remove duties to participants or justify inaccurate reporting. Confidentiality protection and valid consent must accompany methodologically sound research.
Apply it
A trainee plans to begin prospective recruitment while the ethics application is still pending. Explain that approval must precede initiation, and use the preparation period to finalise consent materials, confidentiality arrangements and the protocol's data-management procedures.
Common pitfall: Assuming routine clinical care automatically authorises research use overlooks the study's separate ethical requirements. Removing names alone also may not eliminate the possibility of identifying participants.
Guidelines for Competency Based Training Programme in DNB General Medicine
What to focus on during revision
The following are CertMedbry study suggestions. Use the official outline to check the full scope of your examination.
- Link basic mechanisms to diagnostic clues, particularly ketone-associated acidosis, hormone feedback, inheritance and drug elimination.
- Practise interpreting paired and serial results: creatinine, urine output, albuminuria, pleural measurements, ketones, haematocrit and haemodynamics.
- Build emergency answers around the physiological threat, discriminating investigation, immediate action and reassessment.
- Separate diagnostic evidence from susceptibility or risk markers, including serum urate, HLA results and isolated antibody findings.
- Interpret arrhythmias, functional imaging and numerical diagnostic accuracy alongside their limitations.
- Maintain breadth across associated specialties, oncological emergencies, autoimmune disease, tuberculosis, adolescent health, psychiatry, environmental illness, nutrition and regenerative medicine.
- Connect research methods, consent, confidentiality and rational resource use with everyday clinical decisions.
A practical preparation plan
1. Map the full curriculum
Use the official General Medicine curriculum to create a domain checklist, including practical skills and the smaller sections. Mark these 60 concepts as selected starting points and identify the remaining topics requiring textbook, guideline or supervised clinical study.
2. Write mechanism-to-decision explanations
For each concept, explain the mechanism, decisive clue and tempting alternative aloud. Then change one case detail, such as IgA status, creatinine timing or the direction of haematocrit change, and describe how the interpretation changes.
3. Practise structured short notes
Turn selected concepts into written answers with a definition, relevant mechanism, diagnostic assessment, management principles and monitoring. Use tables or simple labelled diagrams only when they make the clinical reasoning clearer.
4. Integrate bedside and investigation practice
Pair theoretical revision with supervised examination, case presentation and interpretation of ECGs, imaging, blood gases, fluid results and laboratory trends. State what each investigation can establish and what uncertainty remains.
5. Use the learning questions diagnostically
Complete the 20 questions before reading their explanations. For each error, identify whether the problem was a missed cue, incorrect criterion, calculation error or confusion between similar diagnoses, then explain why each competing option was less suitable.
6. Revisit breadth and recent evidence
Use the flashcards for spaced recall, revisit weak domains and discuss current advances alongside established principles. Include research appraisal, communication and ethical reasoning in regular revision rather than leaving them to the end.
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
- NBEMS Curriculum Index
- Guidelines for Competency Based Training Programme in DNB General Medicine
- DNB Final Examination June 2026 Information Bulletin
- FDA Clinical Pharmacology Review: NDA 203389
- MedlinePlus Genetics: Inheritance Risk Assessment
- NHLBI: Heart Valve Diseases—Diagnosis
- 2022 AHA/ACC/HFSA Guideline for the Management of Heart Failure: Clinical Slide Set
- NHLBI: Stroke—Diagnosis
- MedlinePlus: Myasthenia Gravis
- Surviving Sepsis Campaign: Adult Guidelines 2026
- NHLBI: COPD—Diagnosis
- British Thoracic Society Guideline for Pleural Disease, 2023
- KDIGO 2024 Clinical Practice Guideline for Evaluation and Management of CKD
- KDIGO Clinical Practice Guideline for Acute Kidney Injury, 2012
- Hyperglycaemic Crises in Adults with Diabetes: A Consensus Report, 2024
- Endocrine Society: Primary Adrenal Insufficiency Guideline
- AASLD: Antibiotics for SBP Prophylaxis—Why or Why Not?
- NIDDK: Celiac Disease Tests
- NIH Office of Dietary Supplements: Vitamin B12—Health Professional Fact Sheet
- American College of Rheumatology: Gout
- CDC: Evaluation and Diagnosis of Malaria
- CDC: Clinical Care of Dengue
- CDC: Clinical Testing and Diagnosis for Hepatitis B
- Mayo Clinic Laboratories: Bullous Pemphigoid, BP180 and BP230, IgG Antibodies
- Mayo Clinic Laboratories: Desmoglein 1 and Desmoglein 3, IgG Antibodies
- British Association of Dermatologists: Pemphigus Vulgaris, July 2022
- British Association of Dermatologists Guidelines for the Management of Bullous Pemphigoid, 2012
- Cambridge University Hospitals: Delirium in Adult Critical Care
- WHO: Palliative Care
- MedlinePlus Genetics: Mitochondrial DNA
- 2020 American College of Rheumatology Guideline for the Management of Gout
- CDC: Clinical Features of Dengue
- 021821Orig1s000ClinPharmR.pdf
- Child with Suspected Delayed Puberty - Pediatric Endocrine Society
- The ABCDE Approach | Resuscitation Council UK
- ESPEN_practical_and_partially_revised_guideline_Clinical_nutrition_in_the_intensive_care_unit.pdf
- Recommendations | Alcohol-use disorders: diagnosis and management of physical complications | Guidance | NICE
- Recommendations | Hypertension in pregnancy: diagnosis and management | Guidance | NICE
- Recommendations | Neutropenic sepsis: prevention and management in people with cancer | Guidance | NICE
- Lupus & Kidney Disease (Lupus Nephritis) - NIDDK
- SNM%20Procedure%20Guideline%20for%20Myocardial%20Perfusion%20Imaging%20-%202008.pdf
- Stem Cell and Bone Marrow Transplants for Cancer - NCI
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