A. The 1987 ACR criteria

1) Morning joint stiffness > 1 hour

2) Arthritis ≥ 3 joints

3) Hand arthritis

4) Symmetric arthritis

5) Rheumatoid nodules

6) Serum rheumatoid factor positive

7) Typical radiological changes (erosion and/or demineralization in band) to the hands

B. The criteria modified by Liao are three in number

ACR + Anti-CCP Criteria (ACPA)

ACR Criteria without nodules + Anti-CCP (ACPA)

ACR Criteria without nodules or erosions + Anti-CCP (ACPA)