Pathology · single question

In a patient with gout, which substance would you expect to find elevated in the synovial fluid?

  1. Rheumatoid factor
  2. Monosodium urate (uric acid) crystals
  3. C-reactive protein
  4. Creatinine
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Correct answer: B. Monosodium urate (uric acid) crystals

Gout = deposition of monosodium urate crystals in synovial joints, causing acute inflammatory arthritis.
  • A. Rheumatoid factor is associated with rheumatoid arthritis, not gout. RF-negative TMJ arthritis suggests OA or gout, not RA.
  • B. CORRECT. Gout is characterized by elevated serum uric acid and deposition of monosodium urate crystals in joints. Aspiration of joint fluid shows negatively birefringent needle-shaped crystals.
  • C. CRP is a non-specific inflammatory marker — elevated in many conditions, not diagnostic of gout.
  • D. Creatinine is a marker of renal function, not of gout or joint inflammation.

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