What are SDAI and CDAI remission cutoffs?

SDAI remission ≤3.3; low disease activity ≤11; moderate ≤26; high >26. CDAI remission ≤2.8; low ≤10; moderate ≤22; high >22.

Why use CDAI over DAS28?

CDAI requires no laboratory tests (no CRP or ESR), enabling immediate calculation at point of care. It correlates well with SDAI and is preferred for rapid clinical assessment.

What inputs does SDAI require?

SDAI = tender joint count (28) + swollen joint count (28) + patient global assessment (0-10 VAS) + physician global assessment (0-10 VAS) + CRP (mg/dL).

SDAI and CDAI Composite Disease Activity RA

Calculate Simplified Disease Activity Index (SDAI) and Clinical Disease Activity Index (CDAI) for rheumatoid arthritis. CDAI requires no lab values, making it useful in clinic without waiting for results.

Use the full interactive calculator below, or

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Frequently Asked Questions

What are SDAI and CDAI remission cutoffs?

Why use CDAI over DAS28?

What inputs does SDAI require?