Reactive arthritis laboratory findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Laboratory findings

The urethra, cervix and throat may be swabbed in an attempt to culture the causative organisms. Cultures may be carried out on urine and stool samples. Synovial fluid from an affected knee may be aspirated to look at the fluid under the microscope and for culture.

Also, a blood test for the gene HLA-B27 may be given to determine if the patient has the gene. About 75 percent of all patients with Reiter's Syndrome have the gene.