Table 2.

Comparison of the 1987 ACR RA and 2010 ACR/EULAR Classification Criteria for RA

1987 ACR classification criteria	2010 ACR/EULAR classification criteria
1) Morning stiffness >1 h	Who should be tested? Patients with ≥1 swollen joint consistent with synovitis not better explained by another disease. If the patient meets these initial criteria with a score of ≥6/10, he or she can be classified as having “definite RA”:
2) Arthritis of ≥3 joint areas	A. Joint involvement*
3) Hand arthritis	1 large joint	0
4) Symmetric arthritis	2–10 large joints	1
5) Nodules	1–3 small joints	2
6) Elevation of rheumatoid factor	4–10 small joints	3
7) Radiographic changes	>10 joints (at least 1 small)	5
Findings 1–4 must be present for ≥6 weeks. Arthritis must be observed by a physician.	B. Serology (at least 1 test needed)
	Negative RF and ACPA	0
	Low positive RF or ACPA	2
	High positive RF or ACPA**	3
	C. Acute-phase reactants (at least one test needed)
	Normal CRP and ESR	0
	Abnormal CRP or ESR	1
	D. Duration of symptoms
	<6 weeks	0
	≥6 weeks	1

^*Categories of joint distribution are classified according to the location and number of involved joints, with placement into the highest category possible based on the pattern of joint involvement.

^**High positive is equivalent to >3 times the upper limit of normal based on the reference range of the laboratory that assesses the biomarker