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Suspected acute gout with serum urate below the diagnostic threshold during a flare — SCE Rheumatology MCQ

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ModerateGoutSuspected acute gout with serum urate below the diagnostic threshold during a flareSCE Rheumatology

A 56-year-old man presents with his first episode of abrupt-onset severe pain, erythema and swelling of the right first metatarsophalangeal joint. Symptoms began overnight 36 hours ago. He takes bendroflumethiazide for hypertension. He is afebrile, the overlying skin is intact, and there are no systemic features or clinically appreciable effusion suitable for aspiration. His serum urate during the current episode is 332 micromol/L. Renal function is normal. Gout remains strongly suspected clinically. In addition to treating the acute arthritis, which is the most appropriate next diagnostic step?

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

The presentation is strongly suggestive of acute gout: rapid overnight onset of podagra and thiazide exposure, without features making septic arthritis the leading diagnosis. A serum urate below 360 micromol/L during an acute flare does not exclude gout because the concentration can fall during the inflammatory episode. NICE therefore recommends repeating serum urate at least 2 weeks after the flare has settled. Repeating it after 48 hours is too early because the flare-associated reduction may persist. Timing from symptom onset is also inappropriate: a flare may last longer than 2 weeks, so option B could result in measurement during ongoing inflammation. Synovial fluid microscopy is appropriate when the diagnosis remains uncertain, but delayed aspiration of a settled, non-effused first MTP joint is unlikely to be feasible and is not the recommended next step in this strongly suspected presentation. Ultrasound, radiography or dual-energy CT can be considered when aspiration cannot be performed and diagnostic uncertainty persists; immediate DECT is unnecessary before repeating serum urate and is not widely available in UK practice. If the repeat serum urate does not support the diagnosis and uncertainty remains, aspiration or imaging should then be considered.

Reference: Gout: diagnosis and management (NG219) — Recommendations 1.1.7 to 1.1.9 (9 June 2022) — https://www.nice.org.uk/guidance/ng219/chapter/Recommendations Gout: diagnosis and management (NG219) — Rationale and impact: diagnosis (9 June 2022) — https://www.nice.org.uk/guidance/NG219/chapter/rationale-and-impact