🦴 Leiden Prediction Rule (Undifferentiated Arthritis)
UseWhen to use: recent-onset UA when deciding early rheumatology referral / DMARD discussion.
Strata≤6 low, >6–<8 indeterminate, ≥8 high risk of RA at 1 year.
LimitsWhen not to use: already classifiable RA by ACR/EULAR 2010. · Pitfall: omitting anti-CCP when available. · Classification aids referral — not a final diagnosis alone.
Sourcevan der Helm-van Mil AHM, et al. Arthritis Rheum 2007
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
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Methodology · worked example, guidelines & full notes
Age × 0.02.
When to use
When to use: recent-onset UA when deciding early rheumatology referral / DMARD discussion.
How it works
Age×0.02 + sex + joint distribution + symmetry + morning stiffness + TJC + SJC + CRP + RF + anti-CCP (0–14).
Key points
- Age × 0.02.
- ≥8 high risk.
- Next: ACR/EULAR 2010 RA / DAS28.
References
Verification & sources · governance
FAQ
Frequently asked questions
- Does Leiden Prediction Rule (Undifferentiated Arthritis) upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.