Diagnosis of Rheumatoid Arthritis
Target population for this tool:
1) Patients with at least one joint with definite clinical synovitis (swelling).
2) Patients with symptoms not better explained by another disease.
See also the Rheumatoid Arthritis Likelihood calculator

1. Joint involvement <--
Joint involvement refers to any swollen or tender joint on examination, which may be confirmed by imaging evidence of synovitis. DIP, 1st CMP, and 1st MTP are excluded from assessment.
Large joints are shoulders, elbows, hips, knees, and ankles.
Small joints are MCPs, PIPs, 2nd to 5th MTPs, thumb IPs, and wrists.

2. Serology (at least one test result is needed for classification) <--
RF = rheumatoid factor. ACPA = anti-citrullinated protein antibody

3. Acute phase reactants (at least one test result is needed for classification) <--
CRP = C-reactive protein. ESR = erythrocyte sedimentation rate.

4. Duration of symptoms <--

SCORE --> scorescore1=(Q1)+(Q2)+(Q3)+(Q4)
RESULT --> interpretationscore2=(Q1)+(Q2)+(Q3)+(Q4);score2>5?'MEETS 2010 American College of Rheumatology/European League Against Rheumatism Classification Criteria for Rheumatoid Arthritis':'DOES NOT MEET 2010 American College of Rheumatology/European League Against Rheumatism Classification Criteria for Rheumatoid Arthritis'
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Result - Copy and paste this output: