Knee pain/swelling laboratory findings

Knee pain/swelling Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [2]

Overview

If the knee is swollen, red and warm to the touch when compared to the other knee, inflammation due to rheumatoid arthritis or a crystalline arthritis, such as gout or pseudogout, or joint infection can be considered. Besides sending the joint fluid to a laboratory for analysis, white blood cell count, erythrocyte sedimentation rate, and perhaps the level of C-reactive protein or uric acid must also be monitored. If blood tests reveal Lyme's disease antibodies forming, the condition may be attributed to it.

Laboratory Findings

• Complete blood count
• C-reactive protein
• Uric acid
• Alkaline phosphatase
• Erythrocyte sedimentation rate (ESR)