Table 1.

The 2010 ACR/EULAR classification criteria for RA.

Classification Criteria for RA (Total Score ≥ 6 is Considered Satisfactory for the Diagnosis of RA)		Score
joint involvement (swollen or tender joint)	1 large joint (shoulders, elbows, hips, knees, and ankles)	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	Negative RF and negative ACPA (≤upper limit of normal (ULN))	0
	Low-positive RF or low-positive ACPA (≤ULN and ≤3 times)	2
	High-positive RF or high-positive ACPA (≤3 times)	3
acute-phase reactants	Normal CRP and normal ESR	0
	Abnormal CRP or abnormal ESR	1
duration of symptoms	<6 weeks	0
	≥6 weeks	1

CRP = C-reactive protein; ESR = erythrocyte sedimentation rate. * “Small joints” refers to the metacarpophalangeal joints, proximal interphalangeal joints, second through fifth metatarsophalangeal joints, thumb interphalangeal joints, and wrists. ** In this category, at least 1 of the involved joints must be a small joint; the other joints can include any combination of large and additional small joints, as well as other joints not specifically listed elsewhere (temporomandibular, acromioclavicular, sternoclavicular, etc.).