<prompt> HLA B27 is commonly associated with which of the following: March 2010Rheumatic feverRheumatoid ahritisOsteoahritisAnkylosing spondylitis  <response>: Ans. D: Ankylosing Spondylitis HLA-B27 helps in diagnosis of ankylosing spondylitis, Reiters syndrome and at times anterior uveitis. These diseases are chronic disorders that occur more commonly in men than in women. Basically this blood test is conducted to look for specific protein which is found on the white blood cells surface. This protein is known as Human Leukocyte Antigen B27 subtypes B2701-2724. 