Both the Nail Psoriasis Severity Index (NAPSI) and the Nijmegen-Nail Psoriasis Activity Index Tool (N-NAIL) provide accurate cutoffs for diagnosing nail psoriasis, with better accuracy seen for the N-NAIL, according to a study published online in the International Journal of Dermatology.
N-NAIL score more accurate than NAPSI for diagnosing nail psoriasis
