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Suspected gout with a low serum urate during an acute flare — SCE Rheumatology MCQ

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ModerateSerum UrateSuspected gout with a low serum urate during an acute flareSCE Rheumatology

A 58-year-old man presents 20 hours after the abrupt onset of severe pain, erythema and swelling of the right first metatarsophalangeal joint. Contact with the bedclothes is intolerable. He had a similar self-limiting episode 9 months ago and takes bendroflumethiazide for hypertension. He has no fever, skin break, immunosuppression or prosthetic joint. The small joint effusion is insufficient for aspiration. His white cell count is normal and C-reactive protein is 18 mg/L. Serum urate, measured near the peak of the current flare, is 342 micromol/L; an incidental measurement obtained while asymptomatic 8 months earlier was 408 micromol/L. His symptoms improve promptly with colchicine. Which is the most appropriate diagnostic plan regarding his serum urate measurements?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: D — Repeat the serum urate measurement at least 2 weeks after the flare has settled

Explanation lettering: B = shown as A · C = shown as B · A = shown as C · E = shown as D · D = shown as E

The presentation is strongly suggestive of gout: abrupt podagra, marked contact sensitivity, a previous similar attack and thiazide exposure. However, the serum urate measured during the flare is below the NICE diagnostic threshold of 360 micromol/L. Serum urate can fall during an acute flare, so this result does not exclude gout. NICE recommends repeating it at least 2 weeks after the flare has settled. A is incorrect because 300 micromol/L is relevant as a lower treatment target in selected patients with established severe gout, not as the threshold for biochemical support of diagnosis. B incorrectly treats an acute value below 360 micromol/L as an exclusion test. C is tempting because the previous result demonstrates hyperuricaemia, but hyperuricaemia is neither necessary nor sufficient for gout and cannot alone establish the diagnosis. D would be reasonable if aspiration could not be performed and diagnostic uncertainty persisted, but NICE places repeat convalescent serum urate before imaging when gout remains strongly suspected despite a low value during the flare. If the repeat result and clinical assessment remain inconclusive, ultrasound or dual-energy CT may then be considered.

Reference: Gout: diagnosis and management — Recommendations (9 June 2022) — https://www.nice.org.uk/guidance/ng219/chapter/Recommendations Gout: diagnosis and management — Rationale and impact (9 June 2022) — https://www.nice.org.uk/guidance/NG219/chapter/rationale-and-impact