ACR score is a scale to measure change in

rheumatoid arthritis Rheumatoid arthritis (RA) is a long-term autoimmune disorder that primarily affects joints. It typically results in warm, swollen, and painful joints. Pain and stiffness often worsen following rest. Most commonly, the wrist and hands are involv ...

symptoms. It is named after the

American College of Rheumatology The American College of Rheumatology (ACR; until 1985 called American Rheumatism Association) is an organization of and for physicians, health professionals, and scientists that advances rheumatology through programs of education, research, advocacy ...

. The ACR score is more often used in clinical trials than in doctor patient-relationships, as it allows a ''common standard'' between researchers. Different degrees of improvement are referred to as ACR20, ACR50, ACR70. ACR20 was initially proposed with ACR scoring, measuring a 20% improvement on a scale of 28 intervals. ACR50 and ACR70 were later proposed, corresponding to 50% and 70% improvements. The

Rheumatoid Arthritis Severity Scale Rheumatism or rheumatic disorders are conditions causing chronic, often intermittent pain affecting the joints or connective tissue. Rheumatism does not designate any specific disorder, but covers at least 200 different conditions, including art ...

(RASS) is based on sections of the ACR scoring system. The 2010 ACR / EULAR Rheumatoid Arthritis Classification Criteria, which includes anti-CCP testing, has been developed to focus on early disease, and on features that are associated with persistent or erosive disease.

References

Medical scoring system Arthritis {{med-diagnostic-stub