Rheumatology

Clinical Disease Activity Index (CDAI) calculator

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

Clinical inputs

Tender joint count (28 joints)

Swollen joint count (28 joints)

Patient global disease-activity assessment (0–10 cm) (cm)

Evaluator global disease-activity assessment (0–10 cm) (cm)

Result

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Formula inputs

Tender joint count (28 joints)Accepted range: 0 to 28
Swollen joint count (28 joints)Accepted range: 0 to 28
Patient global disease-activity assessment (0–10 cm) (cm)Accepted range: 0 to 10
Evaluator global disease-activity assessment (0–10 cm) (cm)Accepted range: 0 to 10

Primary source

Formula: Aletaha D et al. Acute phase reactants add little to composite disease activity indices for rheumatoid arthritis: validation of a clinical activity score. Arthritis Res Ther. Bands: Aletaha D, Smolen JS. The Simplified Disease Activity Index and Clinical Disease Activity Index: a review of their usefulness and validity in rheumatoid arthritis. Clin Exp Rheumatol (2005)

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