What are the Diagnostic criteria for rheumatoid arthritis?

Diagnostic criteria for rheumatoid arthritis:

For diagnosing rheumatoid arthritis, we have 4 factors to be considered. 

A. Number and type of the affected joints
B. Presence or absence of serological markers
C. Duration of the symptoms 
D. Status of acute phase reactants 

A. Number and type of the affected joints (with score)
  • 1 large joint: 0
  • 2-10 large joints: 1
  • 1-3 small joints: 2
  • 4-10 small joints: 3
  • >10 joints (at least 1 small joint): 5

B. Presence or absence of serological markers (with score)
  • Negative rheumatoid factor(RF) and anti-citrullinated peptide antibody(ACPA): 0
  • Low positive RF or ACPA: 2
  • High positive RF or ACPA: 3

C. Duration of the symptoms(with score)
  • <6 weeks: 0
  • >6 weeks: 1

D. Status of acute phase reactants (with score)
  • Normal ESR and CRP: 0
  • Abnormal ESR or CRP: 1

Patients with a score ≥6 are considered to have definite RA

It is a European League Against Rheumatism/American College of Rheumatology 2010 criteria. 

[Reproduced from Davidson's principles and practice of medicine 23rd; 1023]

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