🦴 CDAI (Clinical Disease Activity Index, RA)
Calculate the Clinical Disease Activity Index (CDAI) for rheumatoid arthritis — a lab-free, immediately available activity measure.
Excludes acute-phase reactants, so it can be scored instantly.
Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.
When to use
Assess RA disease activity at the bedside and support treat-to-target follow-up.
How it works
CDAI = tender joints (0–28) + swollen joints (0–28) + patient global (0–10) + physician global (0–10). ≤ 2.8 remission, ≤ 10 low, ≤ 22 moderate, > 22 high.
Key points
- Excludes acute-phase reactants, so it can be scored instantly.
- Complements DAS28 and SDAI.
- Useful for treat-to-target monitoring.
References
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Tender joint count (0–28) | 5 joints |
|---|---|
| Swollen joint count (0–28) | 3 joints |
| Patient global assessment (0–10) | 4 cm |
| Physician global assessment (0–10) | 3 cm |
→CDAI15.0
- Disease activity：Moderate activity
Frequently asked questions
- What is CDAI (Clinical Disease Activity Index, RA)?
- Calculate the Clinical Disease Activity Index (CDAI) for rheumatoid arthritis — a lab-free, immediately available activity measure.
- How is CDAI (Clinical Disease Activity Index, RA) calculated? What is the core formula?
- CDAI = tender joints (0–28) + swollen joints (0–28) + patient global (0–10) + physician global (0–10). ≤ 2.8 remission, ≤ 10 low, ≤ 22 moderate, > 22 high.
- When is CDAI (Clinical Disease Activity Index, RA) used?
- Assess RA disease activity at the bedside and support treat-to-target follow-up.
- What are the key clinical points for CDAI (Clinical Disease Activity Index, RA)?
- Excludes acute-phase reactants, so it can be scored instantly. Complements DAS28 and SDAI. Useful for treat-to-target monitoring.
- What are the limits and cautions when using CDAI (Clinical Disease Activity Index, RA)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is CDAI (Clinical Disease Activity Index, RA) calculated in practice? Can you show a worked example?
- Inputs: Tender joint count (0–28) 5 joints, Swollen joint count (0–28) 3 joints, Patient global assessment (0–10) 4 cm, Physician global assessment (0–10) 3 cm → Result: CDAI 15.0（Disease activity: Moderate activity）