RH criteria
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"rheumatoid arthritis"[MeSH Terms] AND "classification criteria" AND "ACR EULAR"
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2010 ACR/EULAR Classification Criteria for Rheumatoid Arthritis
Step 1 - Entry Requirements (Both Must Be Met)
Before applying the scoring system, the following must be confirmed:
- At least 1 joint with definite clinical synovitis (swelling)
- The synovitis is not better explained by another disease
If the patient has typical RA erosions on x-ray, they can be classified as RA directly - no scoring needed.
Step 2 - Scoring System (Threshold: ≥6/10 Points = RA)
A. Joint Involvement (0-5 points)
| Pattern | Points |
|---|---|
| 1 medium-large joint | 0 |
| 2-10 medium-large joints | 1 |
| 1-3 small joints (with or without large joint involvement) | 2 |
| 4-10 small joints (with or without large joint involvement) | 3 |
| >10 joints (at least 1 must be a small joint) | 5 |
- Small joints: MCP, PIP, 2nd-5th MTP, thumb IP, wrists
- Medium-large joints: shoulders, elbows, hips, knees, ankles
B. Serology (0-3 points)
| Result | Points |
|---|---|
| Neither RF nor ACPA positive | 0 |
| At least one test low positive (> ULN but ≤ 3× ULN) | 2 |
| At least one test high positive (> 3× ULN) | 3 |
- RF = Rheumatoid Factor; ACPA = Anti-citrullinated protein antibodies (anti-CCP)
- High-titer positivity of either strongly suggests RA and carries the most weight
C. Acute Phase Reactants (0-1 point)
| Result | Points |
|---|---|
| Normal CRP AND normal ESR | 0 |
| Abnormal CRP OR abnormal ESR | 1 |
D. Duration of Synovitis (0-1 point)
| Duration | Points |
|---|---|
| < 6 weeks | 0 |
| ≥ 6 weeks | 1 |
Maximum Score: 10 points | Cut-off: ≥ 6 = Classified as RA
Key Points
- ACPA (anti-CCP) has ~93-98% specificity for RA - even in the first few weeks of illness, its presence is strongly suggestive of aggressive erosive disease
- ~75% of RA patients are RF positive; ~70% are ACPA positive; ~15% are seronegative for both
- The 2010 criteria replaced the 1987 ACR criteria - the older criteria required morning stiffness ≥1 hour, rheumatoid nodules, and symmetric arthritis, but were poor at identifying early disease
- The 2010 criteria are weighted toward early diagnosis - they do not require 6 weeks of disease duration (duration <6 weeks still scores 0, but you can still reach ≥6 total)
- Patients who cannot be classified by scoring but develop typical erosive disease over time can be reclassified retrospectively
Comparison: 2010 vs 1987 ACR Criteria
| Feature | 1987 (Old) | 2010 (Current) |
|---|---|---|
| Morning stiffness ≥1 hr | Required | Not included |
| Rheumatoid nodules | Required | Not included |
| Symmetric arthritis | Required | Not included |
| Anti-CCP (ACPA) | Not included | High weight (3 pts) |
| Radiographic erosions | Required | Shortcut to classify directly |
| Target | Established disease | Early disease |
Source: Goldman-Cecil Medicine, International Edition - ACR/EULAR RA Classification Criteria section
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