The HLA B27 Test » is a blood test used to detect the presence of the HLA-B27 protein, a genetic marker found on the surface of white blood cells. This marker is associated with a higher risk of developing certain autoimmune conditions, particularly ankylosing spondylitis and other forms of inflammatory arthritis. While having HLA-B27 does not guarantee that a person will develop these disorders, its presence can support a diagnosis when symptoms are present. The test helps doctors in confirming or ruling out autoimmune diseases and tailoring the right treatment plan for patients experiencing chronic **** pain or inflammation.