ACR score

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ACR score
Medical diagnostics
Purpose Quantify degree of symptoms in rheumatoid arthritis[1]

ACR score is a scale to measure change in rheumatoid arthritis symptoms.[1][citation needed] It is named after the American College of Rheumatology. 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.[2]

The Rheumatoid Arthritis Severity Scale (RASS) is based on sections of the ACR scoring system.[3]

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.[4]


  1. ^ a b Felson at al. (1995). "ACR Preliminary Definition of Improvement in Rheumatoid Arthritis".
  2. ^ Rocha, Kathleen. "ACR Score: Measuring Rheumatoid Arthritis". Retrieved 4 April 2017.
  3. ^ Bardwell; et al. (2002). "Rheumatoid Arthritis Severity Scale: a brief, physician-completed scale not confounded by patient self-report of psychological functioning".
  4. ^ Aletaha D, Neogi T, Silman AJ, et al. (September 2010). "2010 rheumatoid arthritis classification criteria: an American College of Rheumatology/European League Against Rheumatism collaborative initiative" (PDF). Ann. Rheum. Dis. 69 (9): 1580–8. doi:10.1136/ard.2010.138461. PMID 20699241.