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Simplified Disease Activity Index (SDAI) Calculator

Rheumatoid arthritis disease activity from 5 measures.

Calculates the SDAI = TJC + SJC + Patient global (VAS) + Physician global (VAS) + CRP (mg/dL). Remission ≤ 3.3; low ≤ 11; moderate ≤ 26; high > 26.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

SDAI = TJC + SJC + PtGA + PGA + CRP

In depth

Calculates the SDAI = TJC + SJC + Patient global (VAS) + Physician global (VAS) + CRP (mg/dL). Remission ≤ 3.3; low ≤ 11; moderate ≤ 26; high > 26.