NAPSI Nail Psoriasis Severity Index

Score nail involvement in psoriasis using the Nail Psoriasis Severity Index (NAPSI), evaluating nail matrix (pitting, leukonychia, crumbling, red spots) and nail bed disease in each fingernail.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Score nail involvement in psoriasis using the Nail Psoriasis Severity Index (NAPSI), evaluating nail matrix (pitting, leukonychia, crumbling, red spots) and nail bed disease in each fingernail

Each component has a specific meaning:

  • Nail Psoriasis Severity Index — The nail psoriasis severity index recorded for the scenario being assessed.
  • Evaluating nail matrix (pitting — The evaluating nail matrix (pitting recorded for the scenario being assessed.
  • Leukonychia — The leukonychia recorded for the scenario being assessed.
  • Crumbling — The crumbling recorded for the scenario being assessed.
  • Red spots) — The red spots) recorded for the scenario being assessed.
  • Nail bed disease in each fingernail — The nail bed disease in each fingernail recorded for the scenario being assessed.

Note: Interpret the napsi result against the thresholds and context described above.

How to Use

Enter the Nail Psoriasis Severity Index, evaluating nail matrix (pitting, leukonychia, crumbling, red spots), nail bed disease in each fingernail for the scenario you are assessing. Score nail involvement in psoriasis using the Nail Psoriasis Severity Index (NAPSI), evaluating nail matrix (pitting, leukonychia, crumbling, red spots) and nail bed disease in each fingernail. Use the napsi result to inform your calculation.

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Frequently Asked Questions