Medical Licensing (MD/DO) · Independent exam preparation
MRCP(UK) Part 2 Written: Clinical Reasoning Guide Study Guide
Practise clinical prioritisation, investigation choices and treatment decisions for MRCP(UK) Part 2 Written through 60 focused concepts and original learning drills.
By CertMedbry · Updated 27 October 2026
Practise recognising decisive clinical cues, selecting informative investigations and distinguishing urgent treatment from longer-term management. This guide selects 60 substantive concepts across all 16 official specialties, followed by 20 original questions and 20 flashcards. The official blueprint applicable to your sitting and associated physician training curriculum define the full examination scope; these selected topics do not exhaust it, and their distribution is not an official subtopic allocation.
Try 20 free practice questionsWhat is the exam format?
Check the question types, timing and outline before planning your revision.
How many questions and papers does the examination contain?
There are two papers, each containing 100 questions and lasting three hours: 200 questions across six hours of examination time. Each correct answer earns one mark, with no negative marking.
What question styles should candidates expect?
The examination uses best-of-five questions based on clinical scenarios, sometimes including images. Questions assess diagnosis, investigation, immediate and longer-term management, and prognosis; some concern adolescent medicine. The 20 questions here use four options as independent learning drills and do not reproduce the examination's complete format.
How is the examination delivered?
In-centre delivery begins with the 2026/02 examination, with stated exceptions for Myanmar and Sudan. Candidates affected by those exceptions should check the issuer's current arrangements for their sitting.
Which sitting's blueprint and regulations underpin this guide?
This guide's specialty-weighting advice targets examinations from 2027.3, when the revised blueprint applies. Candidates sitting through 2027.2 must use the separate current blueprint linked on the issuer's format page. The September 2026 examination regulations are version 2.2 and apply from publication. A blueprint filename containing '2026 Update' does not establish that its allocations apply to a 2026 sitting.
Part 2 format — The Federation · MRCP(UK) Part 2 written examination blueprint · Regulations for MRCP(UK) Examination Candidates — version 2.2, September 2026
How are specialties weighted for the target sittings?
From 2027.3, published counts out of 200 are: Cardiology 20; Clinical pharmacology and therapeutics 12; Dermatology 10; Endocrinology, diabetes and metabolic medicine 20; Gastroenterology and hepatology 20; Geriatric medicine 10; Haematology 10; Infectious diseases 16; Medical ophthalmology 4; Neurology 16; Oncology 6; Palliative medicine and end-of-life care 4; Psychiatry 2; Renal medicine 20; Respiratory medicine 20; Rheumatology 10. These correspond to 10%, 6%, 5%, 10%, 10%, 5%, 5%, 8%, 2%, 8%, 3%, 2%, 1%, 10%, 10% and 5%. The five specialties allocated 20 questions each together account for 100 of 200 questions. Through 2027.2, a different blueprint applies, including Clinical pharmacology and therapeutics 18/200, Infectious diseases 19/200 and Psychiatry 3/200. Use the complete blueprint for your sitting when allocating revision time. Published counts indicate likely composition and may vary by up to 2%; small learning sets only approximate these proportions.
Part 2 format — The Federation · MRCP(UK) Part 2 written examination blueprint
How does Part 2 Written relate to Part 1, PACES and medical licensing?
Part 2 Written follows a pass in Part 1 and assesses applied clinical understanding. PACES is the separate Part 2 Clinical examination. All three components are required for the shared postgraduate MRCP(UK) diploma. Part 2 Written alone is not a standalone primary medical licensing examination, and this guide does not cover a different national MRCP pathway.
Part 2 — The Federation · Regulations for MRCP(UK) Examination Candidates — version 2.2, September 2026 · About the colleges — The Federation
MRCP(UK) Part 2 Written is a postgraduate physician membership-diploma examination taken after Part 1. The shared MRCP(UK) diploma requires Part 1, Part 2 Written and Part 2 Clinical (PACES). MRCP(UK), within the Federation, organises examinations for the Royal College of Physicians, Royal College of Physicians of Edinburgh, and Royal College of Physicians and Surgeons of Glasgow. These independently authored learning materials address Part 2 Written.
Outline used: Official Part 2 written blueprint linked as '2026 Update', inspected on 2026-10-10; the blueprint itself prints no precise publication or effective date. Supporting examination regulations: version 2.2, September 2026, applicable from publication. The workbook label maps to the officially named MRCP(UK) Part 2 written examination; the assigned canonical 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.
Cardiology10%
1.How is suspected atrial fibrillation confirmed?
An irregular pulse suggests atrial fibrillation, but an ECG establishes the rhythm diagnosis. Atrial fibrillation produces disorganised atrial electrical activity and an irregular ventricular response; symptoms alone cannot reliably distinguish it from ectopic beats or other tachyarrhythmias. Record an ECG while symptoms are present whenever possible. Confirmation matters because subsequent decisions address different problems: symptom control, ventricular rate or rhythm, and prevention of thromboembolic stroke.
Apply it
A 71-year-old reports new palpitations and breathlessness. Their pulse is irregular at 116 beats/minute, but blood pressure is maintained. Obtain an ECG to identify the rhythm before attributing the symptoms to atrial fibrillation.
Common pitfall: An irregular pulse is a useful trigger for investigation, but treating every irregular pulse as confirmed atrial fibrillation can misclassify ectopy and other rhythms.
2.When does a normal ECG require longer rhythm monitoring?
Paroxysmal atrial fibrillation starts and stops, so a short resting ECG may sample a symptom-free period. A normal tracing therefore does not exclude an intermittent arrhythmia. Ambulatory ECG monitoring extends the observation window, and the recording strategy should match how often symptoms occur. NICE recommends 24-hour monitoring when symptomatic episodes are less than 24 hours apart or asymptomatic episodes are suspected, and an appropriately longer recording period when symptomatic episodes are more than 24 hours apart.
Apply it
A 59-year-old has abrupt, irregular palpitations on several evenings each week. Their clinic ECG shows sinus rhythm. Arrange monitoring over a period likely to capture an episode and correlate symptoms with the rhythm.
Common pitfall: Repeatedly ordering brief ECGs between episodes may leave the same sampling problem unresolved; a normal snapshot cannot establish that intermittent symptoms are non-cardiac.
Atrial fibrillation — NHS · Recommendations | Atrial fibrillation: diagnosis and management | Guidance | NICE
3.Why does rate control not replace anticoagulation in atrial fibrillation?
Rate-control treatment slows the ventricular response and can improve palpitations or breathlessness. Anticoagulation addresses a different mechanism: ineffective atrial contraction promotes blood stasis and clot formation, with embolisation potentially causing stroke. A comfortable patient with a controlled pulse may therefore still need stroke prevention after assessment of thromboembolic and bleeding risks. Neither symptom relief nor a lower heart rate demonstrates that the underlying embolic risk has disappeared.
Apply it
A patient with established atrial fibrillation feels much better after their ventricular rate falls from 132 to 78 beats/minute. Review stroke-prevention needs separately rather than assuming that successful symptom control removes the need for anticoagulation.
Common pitfall: A normal resting pulse describes ventricular rate, not protection from atrial thrombus. Do not use improvement in palpitations as evidence of adequate stroke prevention.
4.How do rate control and rhythm control pursue different goals?
Rate control aims to limit how quickly the ventricles beat while atrial fibrillation continues. Rhythm control aims to restore or maintain a normal rhythm, using approaches such as cardioversion, medicines or ablation when appropriate. Distinguish the treatment objective before judging success: a slower irregular pulse may represent effective rate control without restoration of sinus rhythm. Stroke-prevention decisions remain a separate assessment rather than an automatic consequence of either strategy.
Apply it
An ECG still shows atrial fibrillation after treatment, but the ventricular rate is now controlled and exertional symptoms have improved. Recognise the achieved rate-control goal while considering whether persisting symptoms justify a separate rhythm-control discussion.
Common pitfall: Persistent atrial fibrillation does not automatically mean rate-control treatment has failed; success depends on the intended goal, symptoms and overall clinical assessment.
5.What does echocardiography add to heart failure assessment?
Echocardiography uses ultrasound to assess cardiac structure, pumping function and valve abnormalities. It answers questions that symptoms, an ECG and response to diuretics cannot resolve alone. In a patient with breathlessness and congestion, it can identify impaired ventricular contraction or important valve disease and help explain the mechanism of heart failure. Interpret it alongside the clinical presentation: the investigation characterises cardiac function rather than directly measuring the patient's symptom burden.
Apply it
A 76-year-old has ankle swelling, exertional breathlessness and a systolic murmur. Arrange echocardiography to evaluate ventricular function and valve disease, because either may contribute to the congestion and influence subsequent management.
Common pitfall: Improvement after a diuretic does not identify the structural cardiac abnormality. Conversely, a single pumping-function measurement should not replace assessment of symptoms and valves.
6.Why can furosemide relieve congestion without establishing its cause?
Furosemide is a diuretic that increases urinary salt and water loss, reducing excess fluid responsible for swelling and breathlessness. Its immediate clinical role in congestion is symptom relief through fluid removal. A response supports the importance of fluid accumulation but does not establish the precise cause or complete the assessment of heart failure. Structural investigation and a broader treatment plan remain necessary, with clinical review for excessive fluid loss and adverse effects.
Apply it
A patient with swollen ankles and pulmonary congestion becomes less breathless after diuresis. Continue assessment of the cardiac cause and treatment needs rather than interpreting the response as proof of a particular valve lesion or ventricular abnormality.
Common pitfall: A stronger diuresis is not always a better result. Excessive fluid removal can cause dehydration, so symptom relief must be interpreted alongside clinical reassessment.
Clinical pharmacology and therapeutics6%
7.When should a lithium concentration be sampled?
Routine lithium monitoring uses a standardised concentration approximately 12 hours after the last dose. This is not necessarily immediately before the next scheduled dose. With once-nightly treatment, take the sample the following morning; the next scheduled dose remains that evening. With twice-daily dosing approximately 12 hours apart, the morning sample can coincide with the time immediately before the morning dose. Record dose and sample times because post-dose timing affects interpretation. Suspected toxicity requires urgent assessment without waiting for routine sampling conditions.
Apply it
A patient takes lithium once daily at 21:00. Take the routine sample around 09:00 the next morning. Their next scheduled dose is at 21:00 that evening, rather than immediately after the sample.
Common pitfall: Do not equate every standard 12-hour concentration with a sample immediately before the next dose. That description is incorrect for once-nightly treatment.
Lithium monitoring — NHS Specialist Pharmacy Service · How and when to take lithium - NHS
8.Which symptoms suggest lithium toxicity rather than a benign tremor?
Lithium toxicity can produce gastrointestinal disturbance and neurological dysfunction, including worsening diarrhoea or vomiting, coarse tremor, ataxia, weakness, dysarthria and altered mental state. The pattern and change from baseline matter more than an isolated mild symptom. Dehydration or declining renal function can increase risk. Importantly, toxicity may occur despite an apparently normal plasma concentration, so a reassuring number cannot safely override a convincing clinical syndrome or substantial deterioration.
Apply it
A patient taking lithium develops diarrhoea, an unsteady gait and slurred speech during an intercurrent illness. Treat the combination as suspected toxicity and assess urgently rather than attributing the gait change to ordinary medication tremor.
Common pitfall: A familiar fine tremor should not normalise new ataxia or confusion. Clinical toxicity remains possible even when a reported concentration appears within the usual range.
9.How should suspected lithium toxicity change immediate management?
When lithium toxicity is suspected, withhold lithium, obtain an urgent lithium concentration and urea and electrolyte measurements, and seek specialist advice. This sequence limits further exposure while assessing renal function and the severity of toxicity. The decision is clinical and should not be postponed until a routine monitoring appointment. Review contributing illness and medicines as part of the assessment, because altered fluid balance and renal handling can make a previously stable regimen unsafe.
Apply it
A patient taking long-term lithium becomes confused after several days of poor intake and vomiting. Withhold the next dose and arrange urgent lithium and renal blood tests with specialist assessment, rather than continuing treatment pending routine review.
Common pitfall: Simply booking a later monitoring sample leaves the patient exposed to further lithium. Suspected toxicity requires withholding treatment and urgent assessment, not routine surveillance.
Dermatology5%
10.What makes tense, itchy blisters suggest bullous pemphigoid?
Bullous pemphigoid typically affects older adults and often begins with marked itching before obvious blisters appear. Autoimmune injury separates the epidermis from underlying skin, producing a relatively robust blister roof and therefore tense blisters. This morphology helps distinguish it from the fragile blisters and erosions of pemphigus vulgaris. Age, itch and blister tension provide a useful clinical pattern, but specialist assessment and skin sampling establish the diagnosis rather than appearance alone.
Apply it
An 84-year-old develops weeks of itch followed by large, tense blisters on the trunk and limbs. Bullous pemphigoid becomes a leading diagnosis, prompting dermatology assessment and appropriate biopsy rather than treatment as simple urticaria.
Common pitfall: An itchy pre-blister phase can resemble eczema or urticaria. The later appearance of tense blisters should prompt reconsideration rather than persistence with the initial label.
Pemphigoid — British Association of Dermatologists · Pemphigus vulgaris — British Association of Dermatologists
11.Why do oral erosions and fragile blisters suggest pemphigus vulgaris?
Pemphigus vulgaris is an autoimmune disorder in which antibodies impair adhesion between epidermal cells. Loss of cell-to-cell attachment produces fragile blisters that rupture readily, so painful erosions may be more conspicuous than intact blisters. The mouth is commonly involved and may be affected before the skin. This combination distinguishes the condition from the typically tense, itchy blistering of bullous pemphigoid and makes persistent unexplained oral erosions an important diagnostic clue.
Apply it
A 53-year-old has persistent painful mouth erosions and develops easily ruptured skin blisters that leave raw areas. Consider pemphigus vulgaris and arrange specialist confirmation, rather than assuming the oral lesions and skin disease are unrelated.
Common pitfall: The absence of intact blisters does not exclude a blistering disorder. In pemphigus vulgaris, blister fragility means erosions may dominate the examination findings.
Pemphigus vulgaris — British Association of Dermatologists · Pemphigoid — British Association of Dermatologists
12.Which biopsy findings distinguish pemphigus vulgaris from bullous pemphigoid?
Pemphigus vulgaris shows suprabasal acantholysis on routine histology: epidermal cells lose adhesion above the basal layer. Direct immunofluorescence shows intercellular epidermal IgG, often with complement, in a net-like pattern. Bullous pemphigoid instead produces a subepidermal blister, with linear IgG and C3 along the basement membrane on direct immunofluorescence. Obtain separate appropriately handled samples: a fresh blister edge for routine histology and intact perilesional skin adjacent to a fresh lesion for direct immunofluorescence. The immunofluorescence specimen must use the laboratory's designated transport medium rather than routine formalin.
Apply it
A biopsy shows a subepidermal split, while perilesional direct immunofluorescence shows linear basement-membrane IgG and C3. These findings support bullous pemphigoid rather than pemphigus vulgaris.
Common pitfall: An eroded blister centre can lose diagnostically useful tissue. Sending every specimen in formalin also prevents appropriate direct immunofluorescence assessment.
Pemphigoid — British Association of Dermatologists · Pemphigus vulgaris — British Association of Dermatologists · Dermatology-Handbook-for-Registrars-2022.pdf
Endocrinology, diabetes and metabolic medicine10%
13.How does ACTH distinguish primary from central adrenal insufficiency?
In primary adrenal insufficiency, the adrenal cortex cannot produce sufficient cortisol despite pituitary stimulation, so ACTH rises through loss of cortisol negative feedback. In confirmed cortisol deficiency, an ACTH concentration more than twice the upper reference limit supports a primary adrenal cause. Central adrenal insufficiency instead reflects inadequate hypothalamic or pituitary stimulation. Interpret cortisol and ACTH together, preferably from samples obtained before glucocorticoid treatment when this can be done without delaying emergency care.
Apply it
A stable patient has biochemically confirmed cortisol deficiency and ACTH four times the upper reference limit. Localise the failure to the adrenal glands and assess mineralocorticoid function rather than assuming a pituitary cause.
Common pitfall: A low cortisol result alone does not localise the disorder. ACTH interpretation and treatment timing matter, and emergency glucocorticoids must not wait for perfect sampling.
Primary Adrenal Insufficiency Guideline Resources — Endocrine Society
14.Why are renin and aldosterone assessed in primary adrenal insufficiency?
Primary adrenal disease can impair aldosterone as well as cortisol production. Aldosterone normally supports renal sodium retention and potassium excretion; deficiency can contribute to volume depletion, hypotension and hyperkalaemia. Measuring renin and aldosterone together helps identify mineralocorticoid deficiency: increased renin with an inappropriately low or normal aldosterone is supportive. This assessment informs whether mineralocorticoid replacement is needed, rather than assuming that glucocorticoid replacement alone addresses every hormonal deficit.
Apply it
A patient with newly diagnosed primary adrenal insufficiency has postural dizziness and hyperkalaemia. Assess renin and aldosterone to evaluate mineralocorticoid deficiency and guide replacement needs alongside treatment of the cortisol deficiency.
Common pitfall: Normalising glucocorticoid treatment does not prove that salt and water regulation is adequate. Persistent postural symptoms warrant assessment of mineralocorticoid function and volume status.
Primary Adrenal Insufficiency Guideline Resources — Endocrine Society
15.What is the immediate adult regimen for suspected adrenal crisis?
Suspected adrenal crisis requires immediate adult treatment with hydrocortisone 100 mg IV or IM, followed by 200 mg over 24 hours by continuous IV infusion or divided injections, commonly 50 mg every six hours. Give prompt isotonic fluid resuscitation, usually 0.9% sodium chloride, with repeated assessment of circulation, electrolytes and fluid tolerance. Treat hypoglycaemia if present. Obtain cortisol and ACTH before hydrocortisone only if sampling causes no treatment delay. Cortisol deficiency impairs the stress response, while associated salt and water loss can aggravate circulatory collapse.
Apply it
An adult with weight loss and hyperpigmentation presents with vomiting, profound hypotension and hyponatraemia. Give hydrocortisone 100 mg IV immediately and isotonic fluids, then continue hydrocortisone 200 mg over 24 hours with close reassessment.
Common pitfall: Do not wait for cortisol results or a stimulation test. A single hydrocortisone injection also requires a continuing emergency steroid regimen and fluid reassessment.
Primary Adrenal Insufficiency Guideline Resources — Endocrine Society
16.How is adrenal reserve tested in a stable patient?
A corticotropin stimulation test assesses whether the adrenal glands can increase cortisol production after ACTH stimulation. It is useful when adrenal insufficiency is suspected in a stable patient and the diagnosis needs biochemical confirmation. Interpretation depends on the cortisol assay and laboratory threshold, so one universal numerical cutoff should not be applied indiscriminately. A morning cortisol with ACTH can support preliminary assessment when stimulation testing is not immediately feasible, but does not replace urgent treatment in crisis.
Apply it
A haemodynamically stable patient has persistent symptoms and an inconclusive initial cortisol result. Arrange corticotropin stimulation testing and interpret the stimulated cortisol using the laboratory's assay-specific criteria, while considering ACTH to localise any confirmed deficiency.
Common pitfall: Do not transfer a cortisol cutoff between assays without checking its applicability. A stable diagnostic pathway must also be abandoned if the patient develops crisis.
Primary Adrenal Insufficiency Guideline Resources — Endocrine Society
17.What thyroid test pattern establishes overt thyrotoxicosis?
Suppressed TSH with raised free T4 and/or free T3 establishes overt thyrotoxicosis in the usual primary thyroid setting. Excess circulating thyroid hormone suppresses pituitary TSH through negative feedback. These results do not establish increased hormone synthesis. Hyperthyroidism specifically means increased synthesis, as in Graves' disease or autonomous nodules. Destructive thyroiditis instead releases stored hormone from damaged thyroid cells and causes thyrotoxicosis without hyperthyroidism. A low TSH with normal free thyroid hormones is a different biochemical pattern and does not establish overt thyrotoxicosis.
Apply it
A patient with heat intolerance and weight loss has suppressed TSH and raised free T4. Recognise overt thyrotoxicosis, then investigate whether increased synthesis or release of stored hormone explains it before selecting cause-specific treatment.
Common pitfall: Do not infer hyperthyroidism solely from suppressed TSH and raised hormones. Antithyroid drugs inhibit synthesis and do not treat the hormone leakage of destructive thyroiditis.
Recommendations | Thyroid disease: assessment and management | Guidance | NICE · Thyroiditis | American Thyroid Association · Overactive thyroid: diagnosis — NHS
18.How do antibodies and scanning distinguish causes of thyrotoxicosis?
In adults with confirmed thyrotoxicosis, measure TSH receptor antibodies, or TRAbs, to confirm Graves' disease. If TRAbs are negative, consider technetium scanning to distinguish increased synthesis from transient destructive thyroiditis. Graves' disease typically produces diffuse increased uptake; autonomous nodules produce focal or patchy activity. Destructive thyroiditis typically has low uptake because stored hormone leaks from damaged cells rather than being newly synthesised. This distinction changes treatment: antithyroid drugs can control increased synthesis but do not treat destructive hormone leakage, for which supportive treatment such as beta-blockade may be appropriate.
Apply it
A patient has overt thyrotoxicosis with negative TRAbs. Consider technetium scanning. Low uptake supports destructive thyroiditis, whereas focal autonomous activity supports nodular hyperthyroidism and a different treatment pathway.
Common pitfall: Negative TRAbs do not by themselves diagnose thyroiditis. Use the clinical picture and, when indicated, functional imaging; do not prescribe antithyroid drugs solely because circulating thyroid hormones are raised.
Recommendations | Thyroid disease: assessment and management | Guidance | NICE · Thyroiditis | American Thyroid Association · Overactive thyroid: diagnosis — NHS
Gastroenterology and hepatology10%
19.How does selective IgA deficiency alter coeliac investigation?
Measure total IgA alongside IgA tissue transglutaminase antibodies. Selective IgA deficiency means markedly deficient IgA, conventionally below 0.07 g/L, rather than any mildly reduced result. It can make negative IgA-based serology falsely reassuring. Use IgG-tTG or IgG deamidated gliadin peptide antibodies in this setting. IgG tests also have imperfect sensitivity: clinically suspected coeliac disease with selective IgA deficiency warrants upper gastrointestinal endoscopy with duodenal biopsies alongside IgG serology, and negative IgG results do not exclude disease when suspicion persists. Mildly reduced but detectable IgA requires interpretation with the assay and laboratory rather than automatic classification as selective deficiency.
Apply it
A patient with chronic diarrhoea and iron deficiency has negative IgA-tTG and total IgA below 0.07 g/L. Request IgG-tTG or IgG-DGP and arrange duodenal investigation; a negative IgG result would not complete exclusion.
Common pitfall: Switching antibody class does not make serology fully sensitive. Do not omit duodenal biopsies in a clinically suspicious presentation with selective IgA deficiency.
The 2026 BSG guidelines on the diagnosis and management of adult coeliac disease
20.Why is HLA testing better for excluding than confirming coeliac disease?
Coeliac disease has a strong association with permissive HLA types, principally HLA-DQ2 and HLA-DQ8. Their absence makes the diagnosis very unlikely, whereas their presence is common enough in people without coeliac disease that it cannot establish the diagnosis. HLA testing is therefore selectively useful when standard investigations are inconclusive or dietary gluten restriction complicates assessment. The discriminating concept is asymmetric diagnostic value: an absent prerequisite is more informative than a common susceptibility marker.
Apply it
An adult began a gluten-free diet before investigation and now has uncertain historical results. Selective HLA testing may help exclude coeliac disease if the relevant susceptibility types are absent, but a positive result requires further interpretation.
Common pitfall: A positive susceptibility genotype is not proof of active coeliac disease. Avoid recommending lifelong dietary treatment solely because HLA-DQ2 or HLA-DQ8 is present.
The 2026 BSG guidelines on the diagnosis and management of adult coeliac disease
21.How is coeliac disease investigated after gluten has already been restricted?
Gluten avoidance can reduce coeliac antibodies and intestinal injury, making negative serology or histology unreliable for exclusion. Selective HLA testing can first identify people in whom coeliac disease is very unlikely because susceptibility types are absent. If susceptibility permits disease and confirmation remains necessary, assess for suspected wheat allergy before considering a supervised gluten challenge. The 2026 BSG guideline recommends 3–6 g of gluten daily for at least six weeks, with duodenal histology preferred over serology as the diagnostic endpoint. Discuss tolerability and diagnostic goals before challenge; symptom recurrence alone does not establish coeliac disease.
Apply it
An adult stopped gluten before testing, has negative serology and carries a susceptibility HLA type. After assessment for wheat allergy, agree a supervised challenge of 3–6 g daily for at least six weeks followed by duodenal biopsies if confirmation is needed.
Common pitfall: A few days of gluten followed by repeat antibodies is insufficient for this recommended pathway. Neither symptom improvement during avoidance nor symptoms during challenge are specific diagnostic endpoints.
The 2026 BSG guidelines on the diagnosis and management of adult coeliac disease
22.How is the serum–ascites albumin gradient interpreted?
The serum–ascites albumin gradient, or SAAG, is serum albumin minus ascitic fluid albumin. A gradient of at least 11 g/L supports a portal-hypertensive mechanism of ascites, reflecting the pressure-related distribution of albumin between blood and ascitic fluid. It does not by itself identify cirrhosis as the only possible cause. Interpret the gradient alongside the history, examination and other fluid measurements, while separately assessing whether infection is present.
Apply it
Serum albumin is 34 g/L and ascitic albumin is 16 g/L. The SAAG is 18 g/L, supporting portal hypertension. This calculation explains a mechanism but does not exclude infection or identify one unique disease.
Common pitfall: Do not confuse SAAG with ascitic total protein. A high gradient supports portal hypertension, but neither proves cirrhosis nor rules out concurrent spontaneous bacterial peritonitis.
Guidelines on the management of ascites in cirrhosis — BSG/BASL
23.What ascitic neutrophil count supports spontaneous bacterial peritonitis?
An ascitic polymorphonuclear neutrophil count of at least 250 cells/mm³ supports spontaneous bacterial peritonitis when no surgically treatable intra-abdominal source explains the infection. If a laboratory reports total cells and a neutrophil percentage, calculate the absolute neutrophil count rather than comparing the total count directly with the threshold. Treat culture-negative neutrocytic ascites similarly to culture-positive spontaneous bacterial peritonitis in the appropriate setting because culture sensitivity is imperfect. Treatment should not wait for culture positivity.
Apply it
Ascitic fluid contains 900 cells/mm³, of which 40% are neutrophils. The absolute neutrophil count is 360/mm³. In a patient with cirrhosis and no alternative abdominal source, this supports treatment for spontaneous bacterial peritonitis even if cultures are negative.
Common pitfall: The threshold applies to neutrophils, not all ascitic cells. A negative culture cannot cancel a clinically significant absolute neutrophil count above the threshold.
Guidelines on the management of ascites in cirrhosis — BSG/BASL
24.When should infected ascites prompt investigation for secondary peritonitis?
Secondary bacterial peritonitis arises from an intra-abdominal source, such as perforation, that may require intervention. Consider it when infected ascites accompanies localised abdominal signs, a very high neutrophil count, growth of multiple organisms or an inadequate response to appropriate antibiotics. These findings should prompt cross-sectional abdominal imaging and consideration of early surgical assessment. The ascitic neutrophil threshold identifies infection but does not establish that infection is spontaneous; finding a treatable source changes management.
Apply it
A patient treated for presumed spontaneous bacterial peritonitis has persistent focal abdominal tenderness, polymicrobial ascitic culture and little improvement. Investigate urgently for a secondary abdominal source rather than simply retaining the spontaneous-infection label.
Common pitfall: Cirrhosis does not make every ascitic infection spontaneous. Antibiotics alone may be insufficient when infection results from an abdominal source requiring intervention.
Guidelines on the management of ascites in cirrhosis — BSG/BASL
Geriatric medicine5%
25.What makes a quiet older patient potentially delirious?
Hypoactive delirium causes reduced alertness, withdrawal, slowed responses and impaired attention rather than obvious agitation. Its quiet presentation can be mistaken for tiredness, depression or cooperative behaviour. The defining concern is an acute change with fluctuating cognition and attention, especially during illness or hospitalisation. Recognising this phenotype should trigger assessment for underlying causes and supportive care, because absence of disruptive behaviour does not imply absence of serious acute cerebral dysfunction.
Apply it
An older inpatient who conversed normally yesterday now stares ahead, eats little and cannot sustain attention during conversation. Consider hypoactive delirium and seek acute precipitants rather than documenting that the patient is simply settled.
Common pitfall: Delirium is not synonymous with agitation. A patient who causes little difficulty for staff may still have marked inattention and important acute deterioration.
26.How does the time course distinguish delirium from dementia?
Delirium typically develops over hours or days and fluctuates, with impaired attention central to the syndrome. Dementia usually represents a longer-term decline, although the two conditions can coexist. Collateral history establishes baseline cognition and helps identify a new change that a single bedside encounter might miss. In a person with known dementia, a sudden deterioration should prompt assessment for superimposed delirium rather than being attributed automatically to progression of the chronic disorder.
Apply it
A care-home resident with stable dementia becomes markedly inattentive over one day after an acute illness. Obtain collateral information and assess for superimposed delirium instead of assuming that a rapid change represents ordinary dementia progression.
Common pitfall: A pre-existing dementia diagnosis increases diagnostic complexity; it does not explain every new cognitive change. Establish the timing and baseline before assigning the cause.
27.Which supportive measures reduce delirium risk?
Delirium prevention combines measures that reduce avoidable physiological and environmental stress: orientation, access to glasses and hearing aids, adequate hydration and nutrition, sleep support, mobilisation and medication review. These interventions address several interacting vulnerabilities rather than one isolated neurotransmitter problem. Familiar communication and correction of sensory deprivation help patients interpret their surroundings. Supportive measures accompany assessment and treatment of precipitating illness; they should not be treated as an alternative to investigating an acute change.
Apply it
An older postoperative patient is missing their hearing aids, sleeps poorly and drinks little. Restore sensory aids, provide orientation, support fluids and mobility, and review medicines while assessing pain, infection and other possible contributors.
Common pitfall: Routine sedation does not substitute for prevention or causal assessment. A quieter patient may remain delirious, while sensory deprivation and dehydration continue to worsen vulnerability.
Haematology5%
28.Why does a normal haemoglobin not exclude vitamin B12 deficiency?
Vitamin B12 deficiency can produce neurological symptoms even when anaemia is absent. Numbness, pins and needles, balance problems, cognitive changes or other compatible findings should therefore not be dismissed because haemoglobin is normal. Haematological and neurological consequences do not necessarily appear together. Clinical suspicion should reflect the symptom pattern and risk factors, with appropriate investigation rather than using a normal blood count as a definitive exclusion of a potentially important deficiency.
Apply it
A patient reports progressive distal tingling and unsteadiness despite a normal haemoglobin result. Include vitamin B12 deficiency in the assessment and review relevant risks rather than restricting investigation to causes that always produce anaemia.
Common pitfall: The word 'anaemia' in the condition's name can mislead. Neurological disease may precede or occur without a recognisable anaemic presentation, so blood count reassurance has limits.
29.How does intrinsic factor failure cause vitamin B12 deficiency?
Intrinsic factor is a stomach-produced protein needed for normal vitamin B12 absorption. In pernicious anaemia, an autoimmune process disrupts this pathway, so adequate dietary intake does not guarantee adequate absorption. This distinguishes an absorption problem from insufficient consumption and affects the interpretation of dietary history. A patient who regularly eats animal products can still become deficient if intrinsic factor is unavailable; the mechanism cannot be corrected simply by assuming that more ordinary dietary B12 will be absorbed normally.
Apply it
A patient with confirmed B12 deficiency eats meat, fish and dairy regularly. Consider an absorption disorder such as pernicious anaemia rather than dismissing the deficiency or assuming that poor dietary intake must be the explanation.
Common pitfall: Dietary adequacy and absorptive adequacy are separate questions. A detailed food history cannot exclude pernicious anaemia or establish that the intrinsic factor pathway is intact.
30.Which dietary details meaningfully change vitamin B12 risk?
Vitamin B12 is supplied by foods such as meat, fish, eggs and dairy, and by suitable fortified foods or supplements. A diet excluding animal products increases concern when reliable replacement sources are absent, but the diet label alone does not establish deficiency. Ask specifically about fortified products and supplements, as well as duration and symptoms. Dietary assessment should complement consideration of malabsorption, because low intake and impaired absorption are different mechanisms with potentially similar presentations.
Apply it
An adult following a vegan diet reports fatigue and tingling. Ask about B12-containing supplements and fortified foods before estimating dietary risk, and investigate the symptoms without assuming that all vegan diets provide the same B12 intake.
Common pitfall: Avoid inferring deficiency solely from a dietary label. Fortification and supplementation matter, while an apparently adequate diet still does not exclude an absorption disorder.
Vitamin B12 or folate deficiency anaemia: causes — NHS · Vitamin B12 or folate deficiency anaemia: symptoms — NHS
Infectious diseases8%
31.Why is an IGRA useful after BCG vaccination?
An interferon-gamma release assay measures the immune response to selected tuberculosis antigens. These antigens are absent from BCG vaccine strains, so prior BCG vaccination does not cause a positive IGRA in the way it can affect a tuberculin skin test. This improves interpretation in vaccinated individuals. The result still indicates an immune response associated with tuberculosis infection rather than proving active disease, identifying its anatomical site or establishing whether the person is currently infectious.
Apply it
A BCG-vaccinated healthcare worker has a positive IGRA after exposure assessment. Do not dismiss the result as a vaccine effect; evaluate for tuberculosis infection and assess whether active disease is present.
Common pitfall: BCG history does not explain away a positive IGRA. Equally, an infection test alone cannot determine whether the patient has active pulmonary tuberculosis or is infectious.
Clinical Testing Guidance for Tuberculosis: Interferon Gamma Release Assay — CDC
32.What does a positive IGRA require next?
A positive IGRA usually indicates tuberculosis infection, but it does not distinguish latent infection from active tuberculosis disease. Evaluate symptoms and undertake further assessment, including chest imaging and bacteriological investigation when indicated. This distinction matters because active disease requires a different management pathway and may carry transmission implications. A well person with no evidence of disease and a symptomatic person with abnormal imaging cannot be assigned the same diagnosis solely because both have positive immune-based tests.
Apply it
A patient has a positive IGRA and persistent cough with weight loss. Assess for active tuberculosis using chest imaging and appropriate respiratory specimens rather than immediately classifying the result as latent infection.
Common pitfall: A positive infection test is not an automatic latent-tuberculosis diagnosis. Active disease must be considered before choosing a preventive treatment pathway for an apparently positive screen.
Clinical Testing Guidance for Tuberculosis: Interferon Gamma Release Assay — CDC
33.Why can a negative IGRA fail to exclude active tuberculosis?
A negative IGRA makes tuberculosis infection less likely but cannot exclude it in every clinical setting. False-negative results can occur with impaired immune responses, recent infection or severe tuberculosis disease. Therefore, compatible symptoms or a high-risk presentation should lead to further investigation despite a negative test. The transferable principle is that an immune-response assay has biological sensitivity limits; it should not overrule strong clinical evidence requiring imaging and direct investigation for the organism.
Apply it
An immunosuppressed patient has persistent cough, fever and weight loss but a negative IGRA. Continue evaluation for active tuberculosis, including chest imaging and appropriate specimens, rather than treating the immune assay as a definitive exclusion.
Common pitfall: A negative screen is most misleading when pre-test concern is high or immunity is impaired. Reassurance must reflect the whole presentation, not the result alone.
Clinical Testing Guidance for Tuberculosis: Interferon Gamma Release Assay — CDC
34.When should an early negative IGRA be repeated after exposure?
The immune response detectable by an IGRA takes time to develop after tuberculosis infection. A negative result obtained soon after exposure may therefore fall within a window period. CDC guidance recommends repeating a negative test in contacts eight to ten weeks after their last exposure. This timing addresses delayed immune conversion; it does not justify postponing investigation of symptoms suggesting active disease. Exposure timing and clinical symptoms answer different questions and should both shape the plan.
Apply it
An asymptomatic close contact has a negative IGRA two weeks after the final exposure to infectious tuberculosis. Plan repeat testing eight to ten weeks after that exposure, while advising assessment if symptoms develop before then.
Common pitfall: Count the interval from the last exposure, not merely the first test. New symptoms require disease evaluation rather than waiting for the planned repeat screen.
Clinical Testing Guidance for Tuberculosis: Interferon Gamma Release Assay — CDC
35.How should an indeterminate IGRA be interpreted?
An indeterminate, invalid or borderline IGRA result does not provide a useful classification of tuberculosis infection. Such outcomes can reflect problems with the immune response or with specimen collection, handling and processing, depending on the assay. Repeating the blood test or using another appropriate infection test may help. Interpret the result alongside clinical risk: an uninterpretable laboratory response is neither a confirmed infection nor evidence that active tuberculosis has been excluded.
Apply it
A patient undergoing infection screening has an indeterminate IGRA and no current symptoms. Review possible technical or immune-related limitations and arrange an appropriate repeat or alternative test rather than recording the screen as negative.
Common pitfall: Do not collapse an uninterpretable category into 'negative'. If active disease is suspected, repeating an infection assay alone is insufficient without clinical and microbiological evaluation.
Clinical Testing Guidance for Tuberculosis: Interferon Gamma Release Assay — CDC
Medical ophthalmology2%
36.Which painful red-eye findings demand emergency glaucoma assessment?
Acute angle closure can abruptly obstruct aqueous drainage and cause markedly raised intraocular pressure. Severe eye pain, redness, blurred vision or coloured haloes, headache and nausea form an important emergency pattern. Arrange immediate ophthalmic assessment because vision is threatened. Uveitis can also cause a painful red eye with blurred vision, so symptoms require examination rather than self-classification. Conversely, chronic glaucomatous damage can occur with normal measured pressure; one normal reading does not exclude all glaucoma.
Apply it
A patient develops sudden unilateral eye pain, blurred vision, coloured haloes and vomiting. Treat this as a possible acute angle-closure emergency and obtain immediate ophthalmic assessment rather than offering routine follow-up for uncomplicated conjunctival irritation.
Common pitfall: Normal-pressure glaucoma and acute high-pressure angle closure are different presentations. Do not use knowledge of one to dismiss the emergency features of the other.
Primary angle closure / primary angle closure glaucoma — College of Optometrists · Glaucoma — NHS · Uveitis — NHS
Neurology8%
37.What makes ocular weakness suggest myasthenia gravis?
Myasthenia gravis causes fluctuating muscle weakness that typically worsens with activity and improves with rest. Ptosis and diplopia are common ocular manifestations, and symptoms may become more noticeable later in the day or after sustained use. The useful discriminator is fatigability rather than simply the presence of drooping eyelids. Ask about chewing, swallowing, speech and breathing as well, because apparently ocular symptoms can coexist with clinically important weakness in other muscle groups.
Apply it
A patient has intermittent diplopia and eyelid drooping that worsen after prolonged reading and improve after rest. Consider myasthenia gravis and ask specifically about swallowing, speech and breathing rather than limiting the assessment to the eyes.
Common pitfall: An isolated observation can miss fluctuation. Equally, any ptosis is not automatically myasthenic; the pattern of fatigability and associated symptoms provides the discriminating evidence.
38.How do sensory symptoms redirect assessment of apparent muscle weakness?
Distinguish impaired force generation from sensory disturbance and loss of balance. Fatigable ptosis, diplopia or chewing weakness suggests impaired neuromuscular transmission. Persistent distal numbness, pins and needles and gait imbalance instead require assessment of sensory pathways and causes such as vitamin B12 deficiency. B12-related neurological symptoms can occur without anaemia, so a normal haemoglobin does not end that investigation. Establish the distribution, time course and sensory findings rather than labelling every report of weakness as the same physiological problem.
Apply it
A patient describes weak legs but principally reports persistent numb feet and progressive imbalance, without activity-related ptosis or diplopia. Assess sensation and gait and investigate possible B12 deficiency alongside other sensory neurological causes.
Common pitfall: The patient's word 'weakness' may describe several different impairments. Clarify force, fatigability, sensation and balance before selecting a neuromuscular transmission test.
Vitamin B12 or folate deficiency anaemia: symptoms — NHS · Myasthenia gravis: symptoms — NHS
39.How does electrophysiology support myasthenia diagnosis when antibodies are negative?
Negative myasthenia antibody tests do not exclude the disease, particularly when fatigable weakness remains convincing. Electrophysiology supplies functional evidence: low-frequency repetitive nerve stimulation can show a decrement in compound muscle action potential amplitude as transmission fails across repeated stimuli. Single-fibre EMG can demonstrate increased jitter, reflecting variability in transmission timing, with blocking when transmission fails. These findings support impaired neuromuscular transmission but require interpretation with the clinical syndrome; increased jitter alone is not uniquely specific to myasthenia.
Apply it
An adult has fluctuating chewing fatigue and ptosis despite negative initial antibodies. Specialist repetitive nerve stimulation or single-fibre EMG can test for a transmission defect rather than repeating structural imaging to answer a physiological question.
Common pitfall: A negative antibody result and a normal structural scan cannot exclude a functional transmission disorder. Electrophysiological findings also require clinical interpretation rather than automatic diagnosis.
40.Why is the thymus imaged in myasthenia gravis?
Myasthenia gravis can be associated with thymic abnormalities, including thymoma. Chest CT or MRI may therefore be used to examine the thymus after the disorder is suspected or diagnosed. This investigation looks for an associated structural condition relevant to management; it does not measure fatigability or replace antibody and electrophysiological assessment. Distinguishing the purpose of each test prevents the false assumption that a normal chest scan excludes the neuromuscular disorder itself.
Apply it
A patient has clinical and laboratory evidence supporting myasthenia gravis. Arrange appropriate thymus imaging to assess for an associated abnormality, while explaining that the scan addresses a different question from the tests confirming impaired transmission.
Common pitfall: A normal thymus scan does not disprove myasthenia. Imaging seeks an associated lesion, whereas the diagnosis rests on the clinical syndrome and relevant functional or antibody evidence.
41.When does myasthenic weakness become an emergency?
Myasthenia can affect muscles involved in swallowing, speech and breathing, not only the eyelids and limbs. Rapidly worsening breathlessness, severe swallowing difficulty or major bulbar deterioration requires emergency assessment because airway protection and ventilation may fail. These symptoms carry a different urgency from stable ocular fatigability. Assess the direction and speed of change and seek immediate help when respiratory or bulbar function is threatened, rather than waiting for routine diagnostic confirmation.
Apply it
A patient with known myasthenia develops worsening nasal speech, difficulty swallowing saliva and new breathlessness over several hours. Arrange emergency assessment for bulbar and respiratory deterioration rather than waiting for the next outpatient appointment.
Common pitfall: Previously mild ocular disease does not guarantee continuing low risk. New swallowing or breathing difficulty should override reassurance based on the patient's earlier symptom pattern.
Oncology3%
42.Which cancer-related back-pain features suggest spinal cord compression?
Metastatic spinal cord compression should be suspected when a person with cancer develops concerning spinal pain, particularly with new limb weakness, altered sensation, difficulty walking or bladder or bowel dysfunction. Pain can precede neurological loss, so early warning symptoms matter. Compression threatens spinal neural function and can cause permanent disability. The clinical decision is to recognise a possible oncological emergency before the patient becomes immobile, rather than waiting for every neurological feature to appear.
Apply it
A patient with metastatic cancer reports worsening thoracic pain and new difficulty climbing stairs. Suspect spinal cord compression and initiate urgent assessment even though bladder function is still normal and the patient remains able to walk.
Common pitfall: Normal bladder function does not exclude early compression. Waiting for a complete neurological syndrome risks losing the opportunity to preserve mobility and other functions.
Metastatic Spinal Cord Compression — King's College Hospital · Spinal cord compression: What to look out for — The Christie
43.What immediate pathway is required for suspected metastatic spinal cord compression?
Immediately contact the MSCC coordinator or emergency MSCC service. Arrange MRI as soon as possible and always within 24 hours when compression is suspected. With neurological symptoms or signs, give dexamethasone 16 mg orally or an equivalent parenteral dose as soon as possible, then continue 16 mg daily while awaiting surgery or radiotherapy. Steroid treatment must not wait for imaging. Start immobilisation without delay when symptoms or signs suggest spinal instability, and consider it for moderate or severe movement-related pain. Provide analgesia and urgent specialist assessment while protecting neurological function.
Apply it
A patient with cancer develops spinal pain, new leg weakness and sensory change. Contact the MSCC service immediately, give dexamethasone 16 mg, assess stability precautions and arrange MRI as soon as possible within 24 hours.
Common pitfall: A patient who still walks may already have cord compression. Neither preserved mobility nor temporary analgesic relief justifies delaying steroids, specialist contact or MRI.
metastatic-spinal-cord-compression-initial-assessment-and-management-pdf-13134700768 · Metastatic Spinal Cord Compression (MSCC) (St George's Acute Oncology Service)
Palliative medicine and end-of-life care2%
44.How should reduced intake and noisy breathing be interpreted near death?
In the last hours or days of life, people commonly become less interested in food and drink and may develop noisy breathing as secretions accumulate that they can no longer clear effectively. The sound can distress relatives without necessarily indicating distress in the dying person. Assess comfort and any treatable discomfort, explain the changes, provide mouth and lip care, and consider positioning or symptom treatment. Offer intake according to wishes and swallowing ability rather than forcing it.
Apply it
A dying patient is drowsy, takes only occasional sips and has noisy respiratory secretions without visible distress. Explain the likely changes, assess comfort, provide mouth care and consider repositioning while supporting the family at the bedside.
Common pitfall: Do not infer suffering solely from respiratory noise or force food and drink because intake has fallen. Care should follow comfort, wishes and safe swallowing.
Psychiatry1%
45.How do severity and duration distinguish mania from hypomania?
Mania involves a marked change in mood and activity with symptoms such as reduced need for sleep, increased energy, rapid speech and risky behaviour. Episodes usually last at least seven days, or can be diagnosed at shorter duration when severity requires hospital care. Hypomania is less severe and does not cause the marked impairment associated with mania. Depressive and manic symptoms may occur together, so low mood does not automatically exclude an activated mixed presentation.
Apply it
A patient has slept very little for four nights, spends recklessly, expresses grandiose beliefs and requires hospital care because of severe impairment. The short duration does not make this hypomania when the severity supports mania.
Common pitfall: Reduced sleep means decreased need, not simply insomnia with exhaustion. Duration must be interpreted alongside impairment, hospital-level severity and possible coexisting depressive symptoms.
Renal medicine10%
46.Which complications of acute kidney injury require emergency dialysis consideration?
Renal replacement therapy should be initiated emergently when acute kidney injury causes life-threatening disturbances of fluid, electrolyte or acid–base balance. Examples include severe hyperkalaemia, severe acidosis or pulmonary oedema that cannot be controlled adequately with medical treatment. Uraemic complications can also justify treatment. Consider the broader clinical context, laboratory trends and response to treatment rather than a single urea or creatinine threshold. Similar creatinine concentrations can accompany very different immediate physiological threats.
Apply it
A patient with acute kidney injury remains hypoxic from pulmonary oedema despite appropriate medical treatment and has worsening hyperkalaemia. Escalate urgently for renal replacement therapy assessment rather than waiting for a higher creatinine result.
Common pitfall: Dialysis is not reserved for a predetermined creatinine threshold. Uncontrolled life-threatening complications can require it before creatinine reaches an arbitrarily chosen numerical level.
KDIGO Clinical Practice Guideline for Acute Kidney Injury — 2012
47.Which changes establish acute kidney injury?
KDIGO defines acute kidney injury by any of three criteria: a serum creatinine rise of at least 26.5 micromol/L within 48 hours; a rise to at least 1.5 times baseline known or presumed to have occurred within seven days; or urine output below 0.5 mL/kg/hour for six hours. These criteria detect acute change rather than requiring creatinine to exceed a population reference limit. Review baseline results and urine output, and investigate the cause. Meeting an AKI criterion does not itself establish a dialysis indication.
Apply it
Creatinine rises from 80 to 120 micromol/L within four days. The 1.5-fold rise meets an AKI criterion even if the later value is only modestly abnormal. Assess volume status, medicines, obstruction and other potential causes.
Common pitfall: A laboratory reference interval cannot replace comparison with baseline. Conversely, AKI diagnosis and emergency renal replacement therapy are separate decisions.
KDIGO Clinical Practice Guideline for Acute Kidney Injury — 2012
48.What establishes chronic kidney disease rather than a single abnormal result?
Chronic kidney disease requires abnormalities of kidney structure or function present for at least three months, with implications for health. A single reduced estimated GFR or raised albumin–creatinine ratio does not establish chronicity. Review previous results, clinical history, imaging and repeat measurements as appropriate. Acute kidney injury and acute kidney disease remain possible explanations for newly detected abnormalities, so avoid assigning a chronic diagnosis solely from one laboratory snapshot.
Apply it
A patient has an eGFR of 48 mL/min/1.73 m² during a first recorded acute illness. Review earlier records and reassess kidney function rather than immediately documenting established chronic kidney disease from that one result.
Common pitfall: The three-month criterion concerns persistence, not a mandatory delay in investigating serious disease. Newly detected dysfunction still requires timely assessment for acute and potentially reversible causes.
KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of CKD
49.How should an elevated urine albumin–creatinine ratio be confirmed?
Urine albumin–creatinine ratio estimates albumin excretion while accounting for urine concentration. An elevated result can be transient, so KDIGO recommends confirmation, preferably using a first-morning midstream sample when an initial random sample shows an ACR of at least 3 mg/mmol. Consider factors such as intercurrent illness or exercise that may affect the measurement. Confirmation improves classification, but establishing chronic kidney disease additionally requires evidence of persistence or another qualifying chronic abnormality.
Apply it
An otherwise well adult has an ACR of 7 mg/mmol on a random sample. Arrange a first-morning repeat and review possible transient influences before using the result to classify persistent albuminuria and kidney risk.
Common pitfall: A ratio corrects for urine concentration but not every biological fluctuation. One raised ACR should not automatically be treated as proven persistent albuminuria or chronic kidney disease.
KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of CKD
50.Why does CKD classification include cause, GFR and albuminuria?
KDIGO classifies chronic kidney disease by cause, GFR category and albuminuria category, often abbreviated CGA. These describe different dimensions: the underlying disease, filtration capacity and urinary albumin loss. Patients with the same eGFR can have different risks when albuminuria differs, so filtration alone is incomplete. A useful clinical description therefore identifies the likely cause and both categories, supporting clearer risk assessment and follow-up than a nonspecific statement that renal function is mildly reduced.
Apply it
Two patients have eGFR values near 55 mL/min/1.73 m², but one has marked persistent albuminuria and the other does not. Record both GFR and albuminuria categories rather than assuming identical kidney risk.
Common pitfall: An eGFR category is only part of the description. Omitting albuminuria and cause can hide clinically important differences between patients with similar filtration estimates.
KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of CKD
51.How do GFR and albuminuria thresholds change CKD classification?
G3a denotes eGFR 45–59 and G3b 30–44 mL/min/1.73 m². Albuminuria categories are A1 below 3, A2 from 3 to 30, and A3 above 30 mg/mmol. Use these only after considering chronicity and the underlying diagnosis. An eGFR of 60 or higher does not itself establish CKD without another marker of kidney damage, whereas persistent albuminuria can identify kidney disease even when filtration remains relatively preserved.
Apply it
A patient has eGFR 53 mL/min/1.73 m² and ACR 11 mg/mmol on measurements four months apart. Classify the established chronic abnormality as G3a A2, while also recording or investigating the cause.
Common pitfall: Keep ACR units explicit: mg/mmol and mg/g use different numerical thresholds. An apparently normal eGFR also does not cancel persistent evidence of kidney damage.
KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of CKD
Respiratory medicine10%
52.Which spirometric relationship establishes persistent airflow obstruction?
In a compatible clinical presentation, a post-bronchodilator FEV1/FVC ratio below 0.7 supports persistent airflow obstruction for COPD diagnosis. FEV1 is the volume expired in the first second; FVC is the total forced vital capacity. Their ratio identifies obstruction, whereas FEV1 percentage predicted grades the severity of airflow obstruction after diagnosis. The fixed ratio needs age-related interpretation: a borderline low ratio in an older person without typical symptoms can overdiagnose COPD, while a younger symptomatic person may need further assessment despite a ratio above 0.7.
Apply it
Post-bronchodilator FEV1 is 1.5 L and FVC is 3.0 L: FEV1/FVC = 0.50, supporting obstruction. If predicted FEV1 is 3.0 L, FEV1 is 50% predicted; that percentage describes airflow-obstruction severity rather than providing the diagnostic ratio.
Common pitfall: FEV1 below 70% predicted is not the same measurement as FEV1/FVC below 0.7. Interpret borderline results with age, symptoms and exposures.
53.When must cough and breathlessness prompt investigation beyond airflow obstruction?
Chest radiography can identify alternative or additional explanations for respiratory symptoms, including infection, lung cancer and heart failure. New weight loss or a changed cough should therefore prompt assessment beyond a pre-existing obstructive-airways label. Spirometry measures airflow physiology; a radiograph addresses structural and acute disease. These investigations answer complementary questions, and neither a smoking history nor established COPD explains every subsequent respiratory symptom.
Apply it
A smoker with previously stable exertional breathlessness develops a changed persistent cough and weight loss. Obtain chest imaging to assess an additional cause, including malignancy, rather than attributing the change automatically to airflow obstruction.
Common pitfall: An established respiratory diagnosis can anchor interpretation of new symptoms. A normal radiograph also does not itself exclude physiological airflow obstruction.
54.When does an acidotic COPD exacerbation support bilevel NIV?
ERS/ATS guidance recommends bilevel noninvasive ventilation for acute or acute-on-chronic respiratory acidosis caused by a COPD exacerbation. Raised carbon dioxide with pH at or below 7.35 identifies the acidotic pattern, interpreted with respiratory distress and response to standard treatment. Bilevel support assists inspiration, reduces respiratory muscle work and improves ventilation and carbon dioxide clearance. Raised carbon dioxide without acidosis does not carry the same routine NIV recommendation. Use a monitored setting with an escalation plan because deterioration may require invasive ventilation.
Apply it
Despite initial treatment, a patient with a COPD exacerbation remains distressed with pH 7.29 and PaCO2 8.4 kPa. Consider bilevel NIV in a monitored setting, with reassessment and a clear escalation plan.
Common pitfall: Raised carbon dioxide alone is not the same as acute respiratory acidosis. Improved oxygen saturation also does not prove that ventilation or acidosis has corrected.
Official ERS/ATS clinical practice guidelines: noninvasive ventilation for acute respiratory failure
55.How does positive-pressure support help acute cardiogenic pulmonary oedema?
ERS/ATS guidance supports either CPAP or bilevel NIV for acute respiratory failure due to cardiogenic pulmonary oedema in suitable patients. Positive airway pressure recruits poorly aerated lung, improves oxygenation and reduces respiratory work; its cardiovascular effects can also reduce left ventricular loading. CPAP supplies continuous pressure, while bilevel NIV adds inspiratory pressure support. Select support alongside treatment of the cardiac cause and fluid overload. Cardiogenic shock, inability to protect the airway or an immediate need for intubation requires a different level of management.
Apply it
An alert patient with acute cardiogenic pulmonary oedema remains severely breathless and hypoxaemic despite initial treatment, with maintained blood pressure. Consider monitored CPAP or bilevel NIV while treating the cardiac cause and reassessing response.
Common pitfall: Evidence supporting positive pressure in cardiogenic pulmonary oedema does not mean every hypoxaemic patient is suitable for NIV. Haemodynamic instability and airway protection remain decisive.
Official ERS/ATS clinical practice guidelines: noninvasive ventilation for acute respiratory failure
56.How is the early response to NIV judged?
Assess NIV response through repeated clinical review and blood gases, looking for improvement in respiratory rate, distress and pH. ERS/ATS guidance notes that response in COPD is generally apparent within the first one to four hours. Failure to improve or worsening physiology requires prompt reassessment and possible escalation rather than prolonged ineffective support. More severe acidosis increases the risk of NIV failure, making close monitoring and immediate access to invasive ventilation particularly important.
Apply it
After NIV begins, a patient's respiratory rate rises and repeat blood gases show worsening acidosis. Review urgently for treatment failure and escalation rather than continuing unchanged simply because a mask is in place.
Common pitfall: Starting NIV is the beginning of a monitored treatment trial, not completion of management. Delayed escalation during deterioration can undermine the benefit of respiratory support.
Official ERS/ATS clinical practice guidelines: noninvasive ventilation for acute respiratory failure
57.Why is NIV selection more cautious in pneumonia-related hypoxaemic respiratory failure?
De novo hypoxaemic respiratory failure, such as severe pneumonia without chronic ventilatory disease, differs from an acidotic COPD exacerbation. ERS/ATS guidance makes no general recommendation for NIV in this group because evidence is uncertain and treatment failure can delay necessary intubation. A carefully selected trial requires an experienced team, close intensive-care monitoring, preserved cooperation and airway protection, and no major haemodynamic or multiorgan instability. Persistent high respiratory effort or failure to improve early should trigger prompt escalation rather than prolonged mask support.
Apply it
A previously healthy patient with severe pneumonia remains markedly hypoxaemic and tachypnoeic during a monitored NIV trial. Escalate urgently when there is no early improvement instead of assuming that COPD NIV recommendations apply.
Common pitfall: A temporary saturation improvement can conceal ongoing respiratory distress. The risk of delayed intubation is central when selecting and monitoring NIV in de novo hypoxaemia.
Official ERS/ATS clinical practice guidelines: noninvasive ventilation for acute respiratory failure
Rheumatology5%
58.When should an acutely swollen joint be aspirated?
An acutely painful, swollen joint may represent gout, but uncertainty should prompt joint fluid examination rather than diagnosis from appearance alone. Aspiration can identify urate crystals and help investigate infection. Fever, systemic illness or other concerning features increase the urgency of assessing septic arthritis. The clinical problem is to distinguish competing causes of acute monoarthritis, because a plausible gout history does not make every subsequent hot joint a harmless recurrence of crystal inflammation.
Apply it
A patient with previous gout presents with an unusually severe swollen knee and fever. Arrange urgent assessment and joint aspiration to evaluate infection and crystal arthritis rather than assuming the prior diagnosis explains this episode.
Common pitfall: A history of gout does not exclude joint infection. Avoid allowing a familiar diagnosis to replace assessment of a new, atypical or systemically unwell presentation.
59.What serum urate target guides established gout treatment?
The 2020 ACR guideline recommends a treat-to-target strategy for urate-lowering therapy, with serial serum urate measurements and a target below 6 mg/dL, approximately 360 micromol/L. Sustained lowering addresses the urate burden that permits crystal deposition rather than merely suppressing pain during a flare. Assess the achieved concentration over time and adjust treatment appropriately. The target belongs to long-term disease management; it is not a diagnostic threshold that independently proves the cause of every acute joint symptom.
Apply it
A patient taking urate-lowering therapy feels well but has repeated serum urate values of 7.2 mg/dL. Review treatment against the target rather than assuming that absence of current pain means the urate-lowering objective has been achieved.
Common pitfall: Symptom-free intervals do not prove biochemical control. Conversely, a single serum urate result does not replace clinical assessment or aspiration when acute arthritis is diagnostically uncertain.
2020 American College of Rheumatology Guideline for the Management of Gout
60.Why can gout flares occur while urate-lowering treatment is being established?
Starting or titrating urate-lowering therapy changes the urate environment around existing deposits and can be accompanied by flares before long-term benefit emerges. The ACR guideline recommends accompanying anti-inflammatory prophylaxis when initiating urate-lowering treatment, generally for at least three to six months with ongoing review. Separate the disease-modifying objective of sustained urate reduction from prevention and treatment of inflammatory episodes. An early flare alone does not demonstrate that the long-term strategy is ineffective.
Apply it
A patient develops a flare soon after beginning a planned urate-lowering regimen and asks whether treatment has failed. Explain the early flare risk and review anti-inflammatory prophylaxis and target-based follow-up rather than abandoning long-term control.
Common pitfall: Do not judge a long-term urate strategy solely by an early flare. Prophylaxis, flare treatment and serial urate monitoring serve different but complementary purposes.
2020 American College of Rheumatology Guideline for the Management of Gout
What to focus on during revision
The following are CertMedbry study suggestions. Use the official outline to check the full scope of your examination.
- For sittings from 2027.3, give proportionate attention to the five leading specialties: Cardiology; Endocrinology, diabetes and metabolic medicine; Gastroenterology and hepatology; Renal medicine; and Respiratory medicine. Cover every smaller specialty as well. Use the blueprint applicable to your sitting; the FAQs explain the allocations and blueprint transition.
- For each vignette, identify the decisive cue, the clinical question being asked and the consequence of choosing the wrong next step.
- Separate diagnostic confirmation from causal investigation: ECG versus echocardiography, thyroid biochemistry versus scanning, and coeliac serology versus selective HLA testing.
- Interpret negative tests using their biological limits, especially in intermittent arrhythmia, antibody-negative myasthenia, IgA deficiency and suspected tuberculosis.
- Practise numerical interpretation with units: ascitic neutrophils, SAAG, acute creatinine changes, spirometric ratios, eGFR categories, urine ACR and serum urate targets.
- Recognise time-critical deterioration in adrenal crisis, lithium toxicity, spinal cord compression, acute angle closure, myasthenic respiratory weakness and refractory AKI complications.
- Link management to its objective and clinical setting: stroke prevention versus rate control, decongestion versus structural assessment, and respiratory support in COPD, cardiogenic pulmonary oedema and pneumonia.
A practical preparation plan
1. Map the complete scope
Select the official blueprint applicable to your examination sitting and use it with the associated curriculum as the full study framework. Mark these 60 concepts as selected objectives within it, then identify additional topics and image interpretation needs.
2. Build decision pairs
For each concept, write the decisive cue and the tempting alternative. Explain why one investigation or action answers the clinical question better, including any threshold, time course or test limitation.
3. Calculate before interpreting
Practise absolute ascitic neutrophil counts, SAAG, acute creatinine changes, FEV1/FVC and CKD categories without looking at the worked answer. State units and distinguish diagnostic, classification and emergency-treatment thresholds.
4. Complete the original drills
Answer the 20 questions independently, then review all four options in each explanation. Classify errors as missed urgency, incorrect mechanism, calculation error, test limitation or confusion between treatment goals.
5. Use spaced active recall
Revisit the flashcards after increasing intervals and explain the reasoning aloud. Expand revision beyond this selective set, including clinical images and five-option practice consistent with the official examination format.
6. Practise sustained reasoning
Build toward the official three-hour paper length using appropriately sourced practice material. Track pacing and concentration alongside clinical accuracy; results from these short drills do not predict an examination pass.
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
- Part 2 — The Federation
- Part 2 format — The Federation
- MRCP(UK) Part 2 written examination blueprint
- Regulations for MRCP(UK) Examination Candidates — version 2.2, September 2026
- About the colleges — The Federation
- Atrial fibrillation — NHS
- Echocardiogram — NHS
- Lithium monitoring — NHS Specialist Pharmacy Service
- Pemphigoid — British Association of Dermatologists
- Pemphigus vulgaris — British Association of Dermatologists
- Primary Adrenal Insufficiency Guideline Resources — Endocrine Society
- Overactive thyroid: diagnosis — NHS
- The 2026 BSG guidelines on the diagnosis and management of adult coeliac disease
- Guidelines on the management of ascites in cirrhosis — BSG/BASL
- Guidelines on the Management of Ascites in Cirrhosis — BSG
- Delirium Management — Liverpool Heart and Chest Hospital
- Vitamin B12 or folate deficiency anaemia: symptoms — NHS
- Vitamin B12 or folate deficiency anaemia: causes — NHS
- Clinical Testing Guidance for Tuberculosis: Interferon Gamma Release Assay — CDC
- Glaucoma — NHS
- Myasthenia gravis: symptoms — NHS
- Myasthenia gravis: diagnosis — NHS
- Bipolar Disorder — National Institute of Mental Health
- Metastatic Spinal Cord Compression — King's College Hospital
- Spinal cord compression: What to look out for — The Christie
- Changes in the last hours and days of life — NHS
- KDIGO Clinical Practice Guideline for Acute Kidney Injury — 2012
- KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of CKD
- Official ERS/ATS clinical practice guidelines: noninvasive ventilation for acute respiratory failure
- Gout — NHS
- 2020 American College of Rheumatology Guideline for the Management of Gout
- Furosemide — NHS
- COPD: diagnosis — NHS
- Primary angle closure / primary angle closure glaucoma — College of Optometrists
- Uveitis — NHS
- Recommendations | Atrial fibrillation: diagnosis and management | Guidance | NICE
- How and when to take lithium - NHS
- Dermatology-Handbook-for-Registrars-2022.pdf
- Glaucoma and Eye Pressure | National Eye Institute
- Metastatic Spinal Cord Compression (MSCC) (St George's Acute Oncology Service)
- metastatic-spinal-cord-compression-initial-assessment-and-management-pdf-13134700768
- Recommendations | Thyroid disease: assessment and management | Guidance | NICE
- Thyroiditis | American Thyroid Association
- Recommendations | Delirium: prevention, diagnosis and management in hospital and long-term care | Guidance | NICE
- 1-ABN-autoimmune-myasthenia-gravis-management-guidelines-2025update.pdf
- Stimulated single-fiber electromyography (sSFEMG) in Lambert-Eaton syndrome - PMC
- Recommendations | Care of dying adults in the last days of life | Guidance | NICE
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.