Spondyloarthritis probability calculator

A data-driven approach for the estimation of the disease probability in patients presenting with chronic back pain, suspicion of axial spondyloarthritis, and a priori different likelihoods of the diagnosis based on the data from the OptiRef study.

Please refer to the original publication for details and limitations of the approach.

Pre-test probability
Anticipated prevalence of axial SpA in patients with suspicion of axial spondyloarthritis referred to you
Post-test probability

20%

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* Spondyloarthritis, psoriasis, uveitis, inflammatory bowel disease in first or second-degree relatives.
** Bilateral >= grade II or unilateral >= grade III according to the grading system of the modified New York criteria.

CRP: C-reactive protein; MRI: magnetic resonance imaging; NSAIDs: non-steroidal anti-inflammatory drugs; SIJ: sacroiliac joints; SpA: spondyloarthritis.