Pathology Immunity 58974e14 HLA B-27 has > 90% association with? A Enteropathic B Reactive arthritis C Rheumatoid arthritis D Ankylosing spondylitis High-Yield Explanation Ans. (d) Ankylosing spondylitis(Ref: Harrison 18th/chapter 325)Prevalence of HLA B27 is 90% in patients with Ankylosing Spondylitis, independent of disease severity.