What ASDAS score justifies biologic therapy?

ASDAS ≥2.1 = high disease activity; ≥3.5 = very high. ASAS/EULAR recommend biologic therapy for ASDAS ≥2.1 after failure of ≥2 NSAIDs. Inactive disease: ASDAS <1.3.

How is ASDAS-CRP calculated?

ASDAS-CRP = 0.12 × back pain (0-10) + 0.06 × duration of morning stiffness (0-10) + 0.11 × patient global (0-10) + 0.07 × peripheral joint pain (0-10) + 0.58 × ln(CRP+1).

Can ASDAS be used for non-radiographic axSpA?

Yes. ASDAS is validated for both ankylosing spondylitis (radiographic) and non-radiographic axial spondyloarthritis (nr-axSpA) and is recommended by ASAS for both conditions.

ASDAS Disease Activity Score (Axial SpA)

Calculate ASDAS (Ankylosing Spondylitis Disease Activity Score) using CRP or ESR for axial spondyloarthritis. Stratifies disease activity and guides biologic therapy initiation in AS/nr-axSpA.

Use the full interactive calculator below, or

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