Rheumatology

Simplified Disease Activity Index (SDAI) 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)

C-reactive protein (mg/dL)

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
C-reactive protein (mg/dL)Accepted range: 0 to 100

Primary source

Formula: Smolen JS et al. A simplified disease activity index for rheumatoid arthritis for use in clinical practice. Rheumatology (2003). Bands: Aletaha D et al. Remission and active disease in rheumatoid arthritis: defining criteria for disease activity states. Arthritis Rheum (2005) (2005)

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