Nail Psoriasis Severity Index: A useful tool for evaluation of nail psoriasis

Phoebe Rich, Richard K. Scher

Research output: Contribution to journalArticle

315 Scopus citations


The Nail Psoriasis Severity Index (NAPSI) is a numeric, reproducible, objective, simple tool for evaluation of nail psoriasis. This scale is used to evaluate the severity of nail bed psoriasis and nail matrix psoriasis by area of involvement in the nail unit. The NAPSI will be useful during clinical trials for evaluating response to treatment of psoriatic nails. The scale is reproducible, and because there are few data points, statistical analysis is simplified.

Original languageEnglish (US)
Pages (from-to)206-212
Number of pages7
JournalJournal of the American Academy of Dermatology
Issue number2
StatePublished - Aug 1 2003


ASJC Scopus subject areas

  • Dermatology

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