DAS28-CRP Calculator (Rheumatoid Arthritis)

DAS28-CRP composite disease-activity score for rheumatoid arthritis.

For educational and clinical reference. Not a substitute for medical judgment. See the medical disclaimer.
DAS28-CRP
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Disease activity
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References

  1. Wells G, Becker JC, Teng J, et al. Validation of the DAS28 (CRP) and EULAR response criteria. Ann Rheum Dis. 2009;68(6):954-960.

How to use

  1. Enter the 28-joint tender and swollen counts, CRP (mg/L), and patient global health (0–100 mm).
  2. The DAS28-CRP and activity category update instantly.
  3. Use the same DAS28 variant (ESR or CRP) consistently for follow-up.

Frequently asked questions

What is DAS28-CRP?

The Disease Activity Score on 28 joints using CRP — a composite rheumatoid arthritis activity measure from tender/swollen joint counts, CRP, and patient global health.

What are the DAS28 thresholds?

< 2.6 remission, 2.6–3.2 low activity, > 3.2–5.1 moderate, > 5.1 high disease activity.

Is DAS28-CRP interchangeable with DAS28-ESR?

No — DAS28-CRP generally yields slightly lower values and may misclassify some patients; use the same variant consistently for monitoring.

What CRP units does this use?

CRP in mg/L. The formula adds a fixed constant (0.96) absent from the ESR version.

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