What are the Assessment of SpondyloArthritis International Society (ASAS) diagnostic criteria for axial spondyloarthropathy (SpA)?

Updated: Feb 02, 2021
  • Author: Lawrence H Brent, MD; Chief Editor: Herbert S Diamond, MD  more...
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ASAS classification criteria for axial SpA are as follows [87] :

  • Back pain for 3 months or longer

  • Age at onset < 45 years

  • Sacroiliitis on imaging (plain radiographs or MRI) plus one or more SpA features or

  • HLA-B27 plus two or more other SpA features

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