Calculator · Rheumatology

DAS28-CRP (RA activity)

Disease activity score for rheumatoid arthritis (28-joint count + CRP).

What it is for

RA monitoring & treat-to-target. 5.1 = high activity.

Use the working calculator

The working DAS28-CRP (RA activity) calculator is on our calculators page. It is free and needs no account. Enter the values and it shows the result with the reading that goes with it.

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What you enter

The calculator asks for 4 items.

  • Tender joint count (of 28) (/28)
  • Swollen joint count (of 28) (/28)
  • CRP (mg/L)
  • Patient global assessment (VAS) (mm)0–100 mm.

How the result is read

The result is shown as DAS28-CRP. Formula: 0.56√(TJC28) + 0.28√(SJC28) + 0.36 ln(CRP+1) + 0.014×VAS + 0.96.

The calculator reports one of these readings, with the action that goes with it: Remission; Low activity; Moderate; High activity.

Sources

These are the sources the calculator cites. Check the current version before relying on a threshold.

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For qualified clinicians. A score supports a clinical decision and does not make it: check the inputs, read the cited source, and use the tools in your clinical system for patient care where one is provided.