Test Detail

HLA-B27 PCR, QUALITATIVE

An HLA-B27 PCR qualitative test is a blood test that detects the presence or absence of the HLA-B27 protein on a person's white blood cells. While HLA-B27 is a normal part of the immune system's defense against infections, its presence is associated with an increased risk of autoimmune conditions, particularly ankylosing spondylitis and other forms of spondyloarthritis. A positive test indicates a higher risk, but not a guarantee, of developing these conditions.