2010 American College of Rheumatology (ACR)/European League Against Rheumatism (EULAR) Classification Criteria for Rheumatoid Arthritis

The 1987 ACR definition of RA (see the definition above) has been criticized for a lack of sensitivity in early disease, so these new criteria were created by a new working group. The classification of definite Rheumatoid Arthritis (also called RA) is based on the presence of synovitis (see definition below) in at least 1 joint, absence of another explanation of the synovitis, and a total score of 6 or greater (of a possible 10) from the individual scores in 4 areas: number and site of involved joints (score range 0–5), serologic (i.e. blood serum) abnormality (score range 0–3), elevated acute-phase response (score range 0–1), and symptom duration (2 levels; range 0–1).