🦴 CASPAR Criteria (Psoriatic Arthritis)
UseWhen to use: inflammatory joint/spine/enthesis disease when PsA is in the differential.
Strata≥ 3 with inflammatory disease classifies PsA for classification purposes.
LimitsWhen not to use: without inflammatory articular disease. · Pitfall: counting family history and personal psoriasis incorrectly. · Seronegative RA and SpA mimics remain clinical judgments.
Source中华医学会风湿病学分会 PsA 相关共识 on zh pages when available
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.
Methodology · worked example, guidelines & full notes
Inflammatory disease gate.
When to use
When to use: inflammatory joint/spine/enthesis disease when PsA is in the differential.
How it works
Current psoriasis 2; personal or family history of psoriasis 1 each pathway; nail 1; RF negative 1; dactylitis 1; juxta-articular new bone 1. ≥ 3 points classifies.
Key points
- Inflammatory disease gate.
- Current psoriasis worth 2 points.
- Next: ACR/EULAR RA score if RA more likely; rheumatology referral.
References
- [Guideline / primary source]中华医学会风湿病学分会 PsA 相关共识 on zh pages when available
- Taylor W, et al. Arthritis Rheum 2006 (CASPAR)
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Inflammatory articular disease (joint, spine or enthesis) | No |
|---|---|
| Psoriasis | Personal history (1) |
| Nail dystrophy (onycholysis, pitting, hyperkeratosis) | No (0) |
| Rheumatoid factor negative | No / positive RF (0) |
| Dactylitis (current or history) | No (0) |
| Juxta-articular new bone formation on radiographs | No (0) |
→CASPARNot applicable
- Requirement：Inflammatory articular disease is required before scoring.
| Inflammatory articular disease (joint, spine or enthesis) | Yes (required) |
|---|---|
| Psoriasis | Family history only (1) |
| Nail dystrophy (onycholysis, pitting, hyperkeratosis) | Yes (1) |
| Rheumatoid factor negative | Yes — RF negative (1) |
| Dactylitis (current or history) | Yes (1) |
| Juxta-articular new bone formation on radiographs | Yes (1) |
→CASPAR points5
- Classification：≥ 3 — classifies as PsA
- Psoriasis points：1
Verification & sources · governance
FAQ
Frequently asked questions
- Does CASPAR Criteria (Psoriatic 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.
- How is CASPAR Criteria (Psoriatic Arthritis) calculated in practice? Can you show a worked example?
- Inputs: Inflammatory articular disease (joint, spine or enthesis) No, Psoriasis Personal history (1), Nail dystrophy (onycholysis, pitting, hyperkeratosis) No (0), Rheumatoid factor negative No / positive RF (0), Dactylitis (current or history) No (0), Juxta-articular new bone formation on radiographs No (0) → Result: CASPAR Not applicable（Requirement: Inflammatory articular disease is required before scoring.） Inputs: Inflammatory articular disease (joint, spine or enthesis) Yes (required), Psoriasis Family history only (1), Nail dystrophy (onycholysis, pitting, hyperkeratosis) Yes (1), Rheumatoid factor negative Yes — RF negative (1), Dactylitis (current or history) Yes (1), Juxta-articular new bone formation on radiographs Yes (1) → Result: CASPAR points 5（Classification: ≥ 3 — classifies as PsA, Psoriasis points: 1）