Rheumatology

ASAS Classification Criteria for Axial Spondyloarthritis calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Back pain ≥3 months with onset before age 45 (entry criterion)Sacroiliitis on imaging

SpA features (imaging arm)

features

Allowed range: 0–11 features

See the cited primary source for definitions and scoring details.

HLA-B27 positive

SpA features (HLA-B27 arm)

features

Allowed range: 0–11 features

Result

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Clinical inputs

Back pain ≥3 months with onset before age 45 (entry criterion)
Sacroiliitis on imaging
SpA features (imaging arm)Accepted range: 0 to 11
HLA-B27 positive
SpA features (HLA-B27 arm)Accepted range: 0 to 11

Primary source

Rudwaleit M et al. The development of Assessment of SpondyloArthritis international Society classification criteria for axial spondyloarthritis (part II). Ann Rheum Dis. DOI: 10.1136/ard.2009.108217. PMID: 19297345. Scope: in chronic back pain ≥3 mo with onset <45 y, classify axial SpA via imaging arm (sacroiliitis + ≥1 SpA feature) or clinical arm (HLA-B27 + ≥2 SpA features). (2009)

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