HLA-B27 typing.
D006680:HLA Antigens; D006650:Histocompatibility Testing; D006801:Humans; D007592:Joint Diseases / Q000000981:diagnostic imaging; D011859:Radiography; D012216:Rheumatic Diseases / Q000276:immunology*; D012446:Sacroiliac Joint / Q000000981:diagnostic imaging; D013166:Spondylitis / Q000000981:diagnostic imaging / Q000276:immunology
D006680:HLA Antigens