arthrocentesis

Joint aspiration findings can help narrow the differential diagnosis of joint pain. A synovial fluid leukocyte count of less than 2,000 cells/mL is seen in patients with noninflammatory conditions such as osteoarthritis. Leukocyte counts between 2,000 and 75,000 cells/mL are seen in inflammatory conditions like rheumatoid arthritis and gout. Counts above 100,000 cells/mL suggest infectious arthritis.

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