maratoolDAS28-CRP vs DAS28-ESR
A side-by-side comparison of DAS-28 CRP (Rheumatoid Arthritis) and DAS-28 ESR (Rheumatoid Arthritis).
Both DAS28-CRP and DAS28-ESR are composite measures of rheumatoid arthritis disease activity, combining tender joint count, swollen joint count, patient global assessment, and an acute-phase reactant. The two scores share inputs except for the inflammatory marker — CRP (C-reactive protein) in DAS28-CRP, ESR (erythrocyte sedimentation rate) in DAS28-ESR. They are not interchangeable: the cutoffs differ and the scores can disagree by category in the same patient.
When to use DAS-28 CRP (Rheumatoid Arthritis)
Use DAS28-CRP when CRP is the more reliable inflammatory marker available — which is most modern practice. CRP responds faster to treatment changes, is less affected by anemia or hypergammaglobulinemia, and is the marker tracked in most clinical trials and registries.
When to use DAS-28 ESR (Rheumatoid Arthritis)
Use DAS28-ESR when comparing to historical literature (most RA outcome studies through ~2010 used ESR) or institutional protocols still anchored on ESR. ESR remains accessible and inexpensive, but is less responsive to acute changes than CRP.
Side-by-side comparison
| DAS-28 CRP (Rheumatoid Arthritis) | DAS-28 ESR (Rheumatoid Arthritis) | |
|---|---|---|
| Inputs | TJC28, SJC28, PGA, CRP | TJC28, SJC28, PGA, ESR |
| Remission cutoff | < 2.6 | < 2.6 |
| Low activity | < 3.2 | < 3.2 |
| Moderate activity | 3.2–5.1 | 3.2–5.1 |
| High activity | > 5.1 | > 5.1 |
| Inflammatory marker | CRP (faster response) | ESR (slower, age/sex-influenced) |
| Preferred today | Yes (most modern protocols) | Historical / institutional |
| Lab availability | Universal | Universal |
Bottom line
Score cutoffs match between versions, but DAS28-CRP and DAS28-ESR can disagree by activity category in the same patient. Pick one and stick with it for longitudinal tracking.
Frequently asked questions
Why can the two scores categorize the same patient differently?
CRP and ESR respond to inflammation on different timescales. CRP rises and falls within days, ESR within weeks. In a patient improving on biologics, DAS28-CRP may show low activity while DAS28-ESR still shows moderate activity for several weeks.
Is the "patient global assessment" subjective?
Yes — it is the patient's own rating of disease activity on a 0–100 mm visual analog scale. The subjectivity is intentional: it captures fatigue, stiffness, and pain that the joint counts alone may miss.
Do these scores include patient-reported pain?
Indirectly through the patient global assessment. Pain itself is not a separate input. DAS28 has been criticized for not capturing depression and fatigue contributions to PGA in some patients.
Should I use CDAI or SDAI instead?
CDAI (Clinical Disease Activity Index) and SDAI (Simplified) are alternatives — CDAI removes the lab requirement entirely, useful at point-of-care visits without same-day labs. They are validated and used interchangeably with DAS28 at many centers.