HLA-B7 MAY BE POSITIVE IN PATIENTS WITH SERONEGATIVE SPONDYLOARTHROPATHY, CASES OF JUVENILE SPONDYLOARTHROPATHY AND FEW CASES OF UNDIFFERENTIATED SPONDYLOARTHROPATHY WHO ARE HLA B-27 NEGATIVE. HENCE THIS IS A USEFUL DISEASE MARKER.
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4 ML (3 ML MIN.) WHOLE BLOOD IN 1 LAVENDER TOP (EDTA) TUBE OR 6 ML (3 ML MIN.) WHOLE BLOOD IN 1 YELLOW TOP (ACD) TUBE. SHIP REFRIGERATED. DO NOT FREEZE.