Criteria		Score
Target population (who should be tested?): patients who
	1) have at least one joint with definite clinical synovitis (swelling)*
	2) with the synovitis not better explained by another disease†
Classification criteria for RA (score-based algorithm: add score of categories A through D; a score of ≥ 6 out of 10 is needed for classification of a patient as having definite RA)‡
A. Joint involvement§
	One large joint||	0
	Two to 10 large joints	1
	One to three small joints (with or without involvement of large joints)¶	2
	Four to 10 small joints (with or without involvement of large joints)	3
	> 10 joints (at least one small joint)**	5
B. Serology (at least one test result is needed for classification)††
	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 (at least one test result is needed for classification)‡‡
	Normal CRP and normal ESR	0
	Abnormal CRP or normal ESR	1
D. Duration of symptoms§§
	< six weeks	0
	≥ six weeks	1