<prompt> Which of the following is having a 90 associated with HLA B27Ankylosing spondylitisRheumatoid ahritisPsoriasisReiters syndrome  <response>: Ref Robbins 9e p205 A positive result meansHLA-B27 was found in your blood. You may have a higher-than-average risk of ceain autoimmune diseases, such as ankylosing spondylitis and reactive ahritis. 