What is HLA-B27 blood test? HLA-B27 test is a blood test to diagnoseHLA-B27 gene. This gene predisposes to a number of autoimmune diseases including Ankylosing spondylitis, Reactive arthritis & uveitis. When is HLA-B27 test ordered? Your orthopedic doctor will order HLA-B27 test if he suspects Ankylosing spondylitis, reactive arthritis. The suspicion is raised by inflammatory […]