title: HL-A antigens and sacroiliitis.
abstract: Lymphocyte typing for HL-A B27 is useful under conditions in which data based on history and examination are suggestive but not diagnostic of a seronegative spondyloarthropathy. The presence of HL-A B27 would increase the probability of a patient's having one of these entities, but its absence does not rule out such a diagnosis. Furthermore, tissue-typing allows one to predict the probability that a patient with inflammatory bowel disease will develop AS and the likelihood that the family member of a patient with AS will develop a related disease.
mesh_terms: D000293:Adolescent; D000328:Adult; D001168:Arthritis / Q000000981:diagnostic imaging / Q000276:immunology*; D001170:Arthritis, Infectious / Q000175:diagnosis; D001171:Arthritis, Juvenile / Q000175:diagnosis / Q000276:immunology; D016918:Arthritis, Reactive / Q000175:diagnosis; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006069:Gonorrhea / Q000175:diagnosis; D006680:HLA Antigens / Q000032:analysis*; D006649:Histocompatibility Antigens / Q000032:analysis*; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D011565:Psoriasis / Q000150:complications; D011859:Radiography; D012446:Sacroiliac Joint; D012737:Sex Factors; D013167:Spondylitis, Ankylosing / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000276:immunology; D013577:Syndrome
chemical_list: D006680:HLA Antigens; D006649:Histocompatibility Antigens