Criteria
Psoriasis Area and Severity Index (PASI) score[47]
Composite score grading severity of psoriasis in four body regions according to erythema, scaling, thickness, and the total area of skin affected. Severity of each of erythema, scaling, and thickness is graded from 0 to 4, and the extent of body surface area involvement in each body region is graded categorically from 1 to 6. The final composite score ranges from 0 to 72, with a higher score indicating a greater severity of psoriasis. Online PASI calculators are available. [ PASI Psoriasis Area and Severity Index Opens in new window ]
Physician Global Assessment (PGA)
The PGA was introduced in 1998 by a Food and Drug Administration panel as the preferred tool to assess and record the severity of disease in clinical studies.[47] Typically rates a patient’s disease from "clear" to "severe" or "very severe".
Body surface area (BSA)
BSA percentage is a rapid and easy method to score psoriasis; BSA >10% is considered severe disease.[51]
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