Human Leukocyte Antigen B27
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To assist in diagnosing juvenile rheumatoid arthritis, psoriatic arthritis, ankylosing spondylitis, and Reiter’s syndrome.
Whole blood collected in a green-top (heparin) or a yellow-top (acid-citrate-dextrose [ACD]) tube.
(Method: Flow cytometry) Negative (indicating absence of the antigen).