CASPAR Criteria for Psoriatic Arthritis
CASPAR criteria for psoriatic arthritis: applied after established inflammatory articular disease, >=3 of the 6 points classifies (Taylor 2006).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Entry condition
- Yes
- Psoriasis
- Current psoriasis (2)
- Psoriatic nail dystrophy (onycholysis, pitting, hyperkeratosis)
- Yes
Result: CASPAR 3/6 — inflammatory articular disease and ≥ 3 points: classify as psoriatic arthritis.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Threshold
- entry condition AND ≥ 3 points classifies as psoriatic arthritis (sensitivity 0.91, specificity 0.99). Current psoriasis is the only 2-point item.
What you enter
- Entry condition (established inflammatory articular disease: joint, spine, or entheseal)
- Psoriasis (highest applies)
- Psoriatic nail dystrophy (onycholysis, pitting, hyperkeratosis) (+1)
- Negative rheumatoid factor (any method except latex) (+1)
- Dactylitis (current or recorded history) (+1)
- Juxta-articular new bone formation on hand / foot radiograph (+1)
How this is calculated
- Items
- after the inflammatory-articular-disease entry: psoriasis (current 2 / personal or family history 1), nail dystrophy 1, negative RF 1, dactylitis 1, juxta-articular new bone 1, max 6.
Taylor W, Gladman D, Helliwell P, et al. Classification criteria for psoriatic arthritis: development of new criteria from a large international study. Arthritis Rheum. 2006;54(8):2665-2670. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.