2010 ACR/EULAR rheumatoid arthritis classification criteria
Classifies definite RA in patients with synovitis.
Inputs
1 of 4Joint involvement
Serology (RF or anti-CCP)
Acute phase reactants
Symptom duration
When to use
- At least one swollen joint not better explained by another disease.
Pearls and pitfalls
- Classification criteria, not diagnostic criteria; early RA may not yet score 6.
Why use
The standard RA classification.
| Criterion | Points |
|---|---|
| Joint involvement: 1 large joint | 0 |
| 2–10 large joints | +1 |
| 1–3 small joints | +2 |
| 4–10 small joints | +3 |
| More than 10 joints (at least 1 small) | +5 |
| Serology (RF or anti-CCP): Both negative | 0 |
| Low positive (up to 3× ULN) | +2 |
| High positive (above 3× ULN) | +3 |
| Acute phase reactants: Normal CRP and ESR | 0 |
| Abnormal CRP or ESR | +1 |
| Symptom duration: Under 6 weeks | 0 |
| 6 weeks or longer | +1 |