Calc Function

    • Calcs that help predict probability of a diseaseDiagnosis
    • Subcategory of 'Diagnosis' designed to be very sensitiveRule Out
    • Disease is diagnosed: prognosticate to guide treatmentPrognosis
    • Numerical inputs and outputsFormula
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    Chief Complaint


    Organ System


    Patent Pending

    ASAS Criteria for Peripheral SpondyloArthritis (SpA)

    Diagnoses peripheral spondyloarthritis according to Assessment of SpondyloArthritis International Society (ASAS) criteria.
    When to Use
    • Patients with peripheral arthritis in whom spondyloarthritis is in the differential diagnosis.

    • May be used in conjunction with ASAS Criteria for Axial SpA (use Axial criteria in patients with back pain with or without peripheral manifestations, and Peripheral criteria in patients with peripheral manifestations only).

    Entry criterion

    ≥1 of the following:

    Diagnostic Result:

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    Next Steps
    Creator Insights


    With the limited data on peripheral spondyloarthritis, an international task force recommends targeting treatment to remission or low disease activity (Smolen 2017). 


    Entry criterion

    ≥1 of the following:

    • Peripheral arthritis*

    • Enthesitis

    • Dactylitis

    Required criteria

    ≥1 SpA features:

    • Uveitis

    • Psoriasis

    • Crohn‘s disease or ulcerative colitis

    • Preceding infection

    • HLA-B27

    • Sacroiliitis on imaging

    Or ≥2 additional SpA features:

    • Arthritis

    • Enthesitis

    • Dactylitis

    • Any history of inflammatory back pain

    • Positive family history of SpA

    *Predominantly lower limb and/or asymmetric arthritis.

    Dr. Martin Rudwaleit

    About the Creator

    Martin Rudwaleit, MD, is a rheumatologist at University Hospital Charité, Campus Benjamin Franklin, in Berlin, Germany. He is the principal coordinator of the German Spondyloarthritis Inception Cohort, a prospective longitudinal study on early spondyloarthritis. Dr. Rudwaleit's research interests include clinical aspects of ankylosing spondylitis and other spondyloarthritides.

    To view Dr. Martin Rudwaleit's publications, visit PubMed