SDAI = TJC28 + SJC28 + Evaluator Global (0–10) + Patient Global (0–10) + CRP (mg/dL). Remission ≤3.3, low activity ≤11, moderate ≤26, high >26. Stricter remission criteria than DAS28.

How does SDAI differ from CDAI?

SDAI adds CRP (in mg/dL) to the CDAI formula, incorporating an objective inflammatory marker. SDAI remission (≤3.3) is stricter than CDAI remission (≤2.8) due to the CRP component.

SDAI Rheumatoid Arthritis Activity

Calculate the Simplified Disease Activity Index (SDAI) for rheumatoid arthritis, combining TJC28, SJC28, evaluator global, patient global, and CRP into a single activity score.

Use the full interactive calculator below, or

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SDAI Rheumatoid Arthritis Activity

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Frequently Asked Questions

How is SDAI scored?

How does SDAI differ from CDAI?