II. Indications
III. Criteria
- Points clc: Age (calculated points = AgeYrs * 0.02)
- Points 1.0: Female Gender
- Points 0.5: Small joints of hands or feet affected
- Points 0.5: Symmetric joints involved
- Choose one
- Points 1.0: Upper extremities affected
- Points 1.5: Upper and lower extremities affected
- Choose one
- Points 1.0: Morning stiffness rated at 26-90 mm on a 100 mm visual analog scale
- Points 2.0: Morning stiffness rated at >90 mm on a 100 mm visual analog scale
- Choose one
- Points 0.5: Number of tender joints 4-10
- Points 1.0: Number of tender joints 11 or more
- Choose one
- Points 0.5: Number of swollen joints 4-10
- Points 1.0: Number of swollen joints 11 or more
- Choose one
- Points 0.5: C-Reactive Protein 5 to 50 mg/L
- Points 1.5: C-Reactive Protein >51 mg/L
- Points 1.0: Rheumatoid Factor positive
- Points 2.0: Anti-Citrullinated Protein Antibody positive
IV. Interpretation: Based on total cummulative score tallied from above criteria
- Lower Risk
- Score 0.0 - 3.5: Percentage with RA at one year 0% (LR 0)
- Score 3.5 - 6.5: Percentage with RA at one year 16% (LR 0.4)
- Higher Risk (rheumatology referral indicated)
- Score 6.5 - 8.5: Percentage with RA at one year 57% (LR 3.0)
- Score over 8.5: Percentage with RA at one year 85% (LR 12.7)
V. Resources
- Leiden Clinical Prediction Rule for Undifferentiated Arthritis (MDCalc)