CASPAR criteria for psoriatic arthritis
Classifies psoriatic arthritis in inflammatory articular disease.
Inputs
CompletePsoriasis
Typical psoriatic nail dystrophy
Negative rheumatoid factor
Dactylitis (current or history)
Juxta-articular new bone formation on X-ray
Worked calculation
Your values are highlighted.
- Points
When to use
- Inflammatory joint, spine, or entheseal disease.
Pearls and pitfalls
- 3 or more points classifies PsA (specificity about 99%).
Why use
The standard PsA classification.
| Criterion | Points |
|---|---|
| Psoriasis: None | 0 |
| Family history only | +1 |
| Personal history | +1 |
| Current psoriasis | +2 |
| Typical psoriatic nail dystrophy | +1 |
| Negative rheumatoid factor | +1 |
| Dactylitis (current or history) | +1 |
| Juxta-articular new bone formation on X-ray | +1 |