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DAS28 calculator (ESR and CRP)

Disease Activity Score in 28 joints for rheumatoid arthritis — both ESR and CRP versions, with standard cut-offs.

Nothing is saved or sent anywhere — the calculation happens in your browser.

Tender joint count (0–28)28-joint count

Swollen joint count (0–28)28-joint count

Patient global assessment (0–100 mm)Visual analogue scale; 0 = very well

ESR (mm/hr)For DAS28-ESR

CRP (mg/L)For DAS28-CRP

Result

DAS28-ESR

DAS28-CRP

Cut-offs

Activity	DAS28
Remission	< 2.6
Low	2.6 – 3.2
Moderate	> 3.2 – 5.1
High	> 5.1

Formulas

DAS28-ESR = 0.56×√TJC28 + 0.28×√SJC28 + 0.70×ln(ESR) + 0.014×PGA

DAS28-CRP = 0.56×√TJC28 + 0.28×√SJC28 + 0.36×ln(CRP+1) + 0.014×PGA + 0.96

Prevoo MLL, et al. Arthritis Rheum 1995;38:44–8. Cut-offs per Fransen J, van Riel PLCM. Clin Exp Rheumatol 2005;23(5 Suppl 39):S93–9. 28 joints: shoulders, elbows, wrists, MCP1–5, PIP1–5 (incl. thumb IP), knees.

For healthcare professionals. This calculator supports, and does not replace, clinical judgement. Classification criteria are designed for research cohorts and are not diagnostic criteria. Check results against the source publication before acting on them.

Notes

DAS28-ESR or DAS28-CRP?+

Either is acceptable if used consistently for the same patient. DAS28-CRP generally gives lower values, so applying DAS28-ESR cut-offs to it can over-classify remission.

Does DAS28 include the feet?+

No — the 28-joint count excludes ankles and feet, so active foot disease can be missed. Examine the feet separately.

Referring a patient?

Walk-in rheumatology OPD at AIMS Mohali — no appointment needed. A short referral note with recent results helps.

Clinic timings & location

AIMS Mohali · District Hospital, Phase 6 · Monday & Thursday, 8:00 AM – 2:00 PM · Register by 11:30 AM