Intended for healthcare professionals

The PASI score: how to measure it and what it tells us

Mark Griffiths and Helen Lewis
The Psoriasis Area and Severity Index (PASI) was created in 1978 by Fredriksson and Pettersson. It is a measure of overt redness, thickness (induration) and scaliness of the psoriatic plaques weighted by the area of involvement. A low score generally indicates mild psoriasis. The PASI score is designed for patients with plaque psoriasis, so it is not useful for either palmoplantar or pustular psoriasis.
Dermatology in practice 2012; 18(1): 12–13
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