A synovial fluid sample is collected for a suspected gout patient. Which specimen type is this?

Prepare for the CAMLPR Specimen Collection Competency Test. Practice with diverse question sets including multiple-choice and flashcards. Each question includes hints and explanations to help you become proficient before the exam.

Diagnosing gout hinges on finding monosodium urate crystals directly in the joint fluid. The synovial fluid collected from the affected joint via arthrocentesis is the specimen of choice because it allows microscopic examination with polarized light to reveal needle-shaped, negatively birefringent crystals—diagnostic of gout. This direct crystal evidence distinguishes gout from other joint issues and from septic arthritis, which would require culture or Gram stain on the same sample. Serum uric acid or urine tests can be supportive but are not definitive, since uric acid levels can be normal during an attack.