EpistemisASAS Classification Calculator for Axial Spondyloarthritis (Axial SpA)
Mandatory Application Criteria: Patient with persistent back pain for ≥ 3 months and age of onset < 45 years.
Required inputs
| Variable | Example value |
|---|---|
| Sacroiliitis demonstrated by Imaging: Active sacroiliitis (subchondral bone marrow edema) by magnetic resonance imaging OR definitive radiographic sacroiliitis (unilateral grade ≥ 3 or bilateral ≥ 2). | — |
| Genetics: Confirmed presence of the positive HLA-B27 allele. | — |
| Inflammatory low back pain (improves with exercise, worse with rest, nocturnal) | low back pain |
| Peripheral asymmetric arthritis predominantly in the lower extremities | arthritis |
| Enthesitis of the Achilles tendon or plantar fascia | enthesitis |
| Acute anterior uveitis demonstrated by slit lamp | uveitis |
| Dactylitis (generalized inflammation of the finger) | dactylitis |
| Psoriasis diagnosed | psoriasis |
| Inflammatory Bowel Disease (Crohn's or Ulcerative Colitis) | eii |
| Very elevated acute phase reactants (CRP or ESR) | pcr |
| Excellent initial clinical response to NSAIDs (resolution within 48 hours) | resp_fame |
| Direct family history of spondyloarthritis | history |
Run the calculation in the app
This page explains the score but does not run it. In Epistemis, the calculator validates units, flags values outside physiological ranges, and provides the interpretation that a number alone cannot convey.
Epistemis is educational review material. It is not a medical device, does not diagnose or prescribe treatment, and does not replace formal medical training, current clinical guidelines, or professional clinical judgment.
- Specialty
- Rheumatology
- Area
- Internal Medicine
- Variables
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