What is the ACR/EULAR classification system for rheumatoid arthritis (RA)?

Updated: Feb 07, 2020
  • Author: Howard R Smith, MD; Chief Editor: Herbert S Diamond, MD  more...
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The ACR/EULAR classification system is a score-based algorithm for RA that incorporates the following 4 factors:

  • Joint involvement
  • Serology test results
  • Acute-phase reactant test results
  • Patient self-reporting of the duration of signs and symptoms

The maximum number of points possible is 10. A classification of definitive RA requires a score of 6/10 or higher. Patients with a score lower than 6/10 should be reassessed over time. If patients already have erosive changes characteristic of RA, they meet the definition of RA, and application of this diagnostic algorithm is unnecessary. [1]

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