NAPSI (Nail Psoriasis Severity Index)

Quantifies nail psoriasis severity in a single nail, from four nail-matrix and four nail-bed features.

For healthcare professionals.These calculate a score or a measurement from values you enter. They do not diagnose, and they are no substitute for clinical judgement. If you are a patient, discuss any result with your own doctor rather than acting on it.

Pitting

Leukonychia

Red spots in the lunula

Nail plate crumbling

Onycholysis

Splinter hemorrhage

Subungual hyperkeratosis

Oil-drop (salmon patch) discoloration

Per-nail score

0 / 8

Nail matrix score0 / 4

Nail bed score0 / 4

Repeat per nail and sum across all involved nails (up to 80 for all 10 fingernails) for a total-hand score.

Source

Rich P, Scher RK. Nail Psoriasis Severity Index: a useful tool for evaluation of nail psoriasis. J Am Acad Dermatol. 2003;49(2):206-212.

Shown for reference and checked against the source above. Confirm against current guidance before acting on it, and use your own clinical judgement.

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