Table 1.

The 2010 American College of Rheumatology (ACR) and European League Against Rheumatism (EULAR) classification criteria for rheumatoid arthritis7

Joints distribution (0–5)
  • 1 large joint

0
  • 2–10 large joints

1
  • 1–3 small joints (large joints not counted)

2
  • 4–10 small joints (large joints not counted)

3
  • >10 joints (at least 1 small joint)

5
Serology (0–3)
  • Negative RF AND negative ACPA

0
  • Low positive RF OR low positive ACPA

2
  • High positive RF OR high positive ACPA

3
Symptom duration (0–1)
  • <6 weeks

0
  • ≥6 weeks

1
Acute phase reactants (0–1)
  • Normal CRP AND normal ESR

0
  • Abnormal CRP OR abnormal ESR

1
  • Total score ≥6 = classification of ‘definite’ RA. The score can be calculated prospectively over time (cumulatively) or retrospectively if data have been recorded in the past.

  • ACPA = anti-cyclic citrullinated protein antibody; CRP = C-reactive protein; ESR = erythrocyte sedimentation rate; RF = rheumatoid factor.