ASAS Criteria for Axial Spondyloarthritis (SpA)

RheumatologyBeta toolThis tool is in beta. It has undergone internal validation but still requires additional testing. Always confirm the data entered and the results obtained before clinical use. It should not be used as the sole basis for clinical decisions.

Age at onset of back pain

years

Chronic back pain for at least 3 months

NoYes

MRI positive for active sacroiliitis highly suggestive of SpA

NoYes

Definite radiographic sacroiliitis by modified New York criteria

NoYes

HLA-B27 positive

NoYes

Inflammatory back pain

NoYes

Arthritis

NoYes

Heel enthesitis

NoYes

Uveitis

NoYes

Dactylitis

NoYes

Psoriasis

NoYes

Crohn's disease or ulcerative colitis

NoYes

Good response to NSAIDs

NoYes

Family history of spondyloarthritis

NoYes

Elevated CRP

NoYes

Enter the data

The result appears automatically once all required fields are complete.

Clinical noticeClinical decision support; not a substitute for clinical evaluation and judgment.

Context and use

Method

Applicable only when chronic back pain lasts at least 3 months and began before age 45 years. Classification is met through the imaging arm (sacroiliitis on imaging plus at least one SpA feature) or the clinical arm (HLA-B27 positive plus at least two other features).