2010 EULAR/ACR classification criteria for RA [2]
| RA may be suspected in patients who: have at least one joint with definite clinical synovitis with the synovitis not better explained by another disease | |
|---|---|
| a score of 6/10 is needed for classification of a patient as having definite RA | |
| JOINT INVOLVEMENT (swollen or tender joints on examination, with synovitis confirmed by imaging, e.g. MRI or ultrasound scans; distal interphalangeal joints and first metatarsophalangeal joints are excluded from assessment) | |
| 1 large joint (shoulder, elbow, hip, ankle) | 0 |
| 2–10 large joints | 1 |
| 1–3 small joints (with or without involvement of large joints) | 2 |
| 4–10 small joints (with or without involvement of large joints) | 3 |
| > 10 joints (at least 1 small joint) | 5 |
| SEROLOGY (at least one test result is needed for classification) | |
| Negative RF and anti-CCP | 0 |
| Positive RF or anti-CCP ≤ 3 x ULN | 2 |
| Positive RF or anti-CCP > 3 x ULN | 3 |
| INFLAMMATION PARAMETERS (at least one test result is needed for classification) | |
| normal CRP or ESR | 0 |
| increased CRP or ESR | 1 |
| DURATION OF SYMPTOMS | |
| < 6 weeks | 0 |
| ≥ 6 weeks | 1 |
1987 ACR classification criteria for RA [1]
| RA is diagnosed when at least 4 criteria are met. Criteria 1–4 must have been present for at least 6 weeks |
|---|
| 1. Morning joint stiffness lasting at least 1 hour |
| 2. Arthritis of at least 3 joints, except for DIP, shoulder and temporomandibular joints |
| 3. Arthritis of at least 1 hand joint (at least one joint area swollen in the wrist, MCP or proximal interphalangeal – PIP joints) |
| 4. Symmetric arthritis |
| 5. Rheumatoid nodules |
| 6. Positive RF |
| 7. Radiographic changes (erosions) in hand or wrist joints in AP view |