Treating psoriasis

Treating psoriasis

PASI assessment1-3

Psoriasis Area and Severity Index (PASI) is a formal system used to measure the severity and extent of psoriasis, before and after treatment. The score ranges from 0 to 72, according to the intensity of psoriasis – degree of redness, thickness and scaling of plaques – and the proportion of the body affected.



Assessing intensity of psoriasis1-3


The degree of each plaque characteristic is graded from 0 (none) to 4 (very severe).


Your quality of life is part of the assessment5,6

The Dermatology Life Quality Index (DLQI) is a questionnaire used to assess the impact of a skin condition on quality of life.
A score >10 immediately classifies psoriasis as moderate-to-severe, regardless of the PASI score.

DLQI score

Impact on QoL6


No effect at all


Small effect


Moderate effect


Very large effect


Extremely large effect

Whatever your treatment goals are, be sure to share them with your doctor, so that together you can work towards the best outcome for you.


  1. DermNet NZ. PASI score. Available at
  2. Fredricksson T, Pettersson U. Dermatologica 1978; 157: 238–44.
  3. Feldman SR, Krueger GG. Ann Rheum Dis 2005; 64(Suppl II): ii65–ii68.
  4. Mrowietz U, et al. Arch Dermatol Res 2011; 303: 1–10.
  5. Baker C, et al. Aust J Derm 2013; 54: 148–54.
  6. Dermatology Life Quality Index (DLQI) – instructions for use. Available at

This educational resource is not intended to replace discussions with your healthcare team. If you have any questions about your condition or treatment, please contact your doctor.