ACR score

Short description: Scale to measure change in rheumatoid arthritis symptoms

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] 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]

## References

1. ↑ 1.0 1.1 Felson at al. (1995). ACR Preliminary Definition of Improvement in Rheumatoid Arthritis.. http://www.rheumatology.org/practice/clinical/response/205070.asp.
2. ↑ Rocha, Kathleen. "ACR Score: Measuring Rheumatoid Arthritis". https://www.rheumatoidarthritis.org/treatment/acr-score/. Retrieved 4 April 2017.
3. ↑ Bardwell (2002). "Rheumatoid Arthritis Severity Scale: a brief, physician-completed scale not confounded by patient self-report of psychological functioning.". Rheumatology 41 (1): 38–45. doi:10.1093/rheumatology/41.1.38. PMID 11792878.
4. ↑ "2010 rheumatoid arthritis classification criteria: an American College of Rheumatology/European League Against Rheumatism collaborative initiative". Ann. Rheum. Dis. 69 (9): 1580–8. September 2010. doi:10.1136/ard.2010.138461. PMID 20699241. http://www.rheumatology.org/practice/clinical/classification/ra/2010_revised_criteria_classification_ra.pdf.

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