Table 1.
The 2010 American College of Rheumatology/European league against rheumatism classification criteria for rheumatoid arthritis.a
| Classification criteria for RA | Score |
|---|---|
| A. Joint involvement | |
| 1 Large joint | 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 |
| B. Serology | |
| Negative RF and negative ACPA | 0 |
| Low-positive RF or low-positive ACPA | 2 |
| High-positive RF or high-positive ACPA | 3 |
| C. Acute-phase reactants | |
| Normal CRP and normal ESR | 0 |
| Abnormal CRP or abnormal ESR | 1 |
| D. Duration of symptoms | |
| <6 Weeks | 0 |
| >6 Weeks | 1 |
a
A patient is classified as RA with a score of 6 or greater.