Exam

Rheumatoid Arthritis Prediction Rule for Undifferentiated Arthritis

Rheumatoid Arthritis Prediction Rule for Undifferentiated Arthritis, Leiden Clinical Prediction Rule for Undifferentiated Arthritis

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
1. Points 1.0: Upper extremities affected
2. Points 1.5: Upper and lower extremities affected
Choose one
1. Points 1.0: Morning stiffness rated at 26-90 mm on a 100 mm visual analog scale
2. Points 2.0: Morning stiffness rated at >90 mm on a 100 mm visual analog scale
Choose one
1. Points 0.5: Number of tender joints 4-10
2. Points 1.0: Number of tender joints 11 or more
Choose one
1. Points 0.5: Number of swollen joints 4-10
2. Points 1.0: Number of swollen joints 11 or more
Choose one
1. Points 0.5: C-Reactive Protein 5 to 50 mg/L
2. Points 1.5: C-Reactive Protein >51 mg/L
Points 1.0: Rheumatoid Factor positive
Points 2.0: Anti-Citrullinated Protein Antibody positive

Lower Risk
1. Score 0.0 - 3.5: Percentage with RA at one year 0% (LR 0)
2. Score 3.5 - 6.5: Percentage with RA at one year 16% (LR 0.4)
Higher Risk (rheumatology referral indicated)
1. Score 6.5 - 8.5: Percentage with RA at one year 57% (LR 3.0)
2. Score over 8.5: Percentage with RA at one year 85% (LR 12.7)