ACR score for rheumatoid arthritis
Different degrees of improvement are referred to as ACR20, ACR50, ACR70. The ACR score is more often used in clinical trials than in doctor patient-relationships, as it allows a 'common standard' between researchers.
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. 
- Felson at al. (1995). "ACR Preliminary Definition of Improvement in Rheumatoid Arthritis.".
- Bardwell et al. (2002). "Rheumatoid Arthritis Severity Scale: a brief, physician‐completed scale not confounded by patient self‐report of psychological functioning.".
- 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". Ann. Rheum. Dis. 69 (9): 1580–8. doi:10.1136/ard.2010.138461. PMID 20699241.
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