Table 1.

CASPAR: PsA classification criteria.

Reprinted with permission from Taylor et al. [12]

To meet the criteria for PsA classification, a patient must have inflammatory articular disease of the joint, spine, or entheses with ≥3 points from the following five categories:
Criterion		Point
1	Evidence of current psoriasis,a a personal history of psoriasis, or a family history of psoriasis
	Current psoriasis	2
	Personal history of psoriasis, which may be obtained from a patient, family physician, dermatologist, rheumatologist, or other qualified healthcare provider	1
	Family history of psoriasis (i.e. first- or second-degree relative)	1
2	Typical psoriatic nail dystrophy, including onycholysis, pitting, and hyperkeratosis observed on current physical examination	1
3	A negative test result for the presence of rheumatoid factor by any method except latex, but preferably by enzyme-linked immunosorbent assay or nephelometry, according to the local laboratory reference range	1
4	Current dactylitis or a history of dactylitis recorded by a rheumatologist	1
5	Radiographic evidence of juxta-articular new bone formation, appearing as ill-defined ossification near joint margins (but excluding osteophyte formation) on plain radiographs of the hand or foot	1

CASPAR classification criteria for psoriatic arthritis, PsA psoriatic arthritis

^aPsoriatic skin or scalp disease present today, as judged by a rheumatologist or dermatologist