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Patient-oriented PASI score

Dr Sam MacGill, Medical Student, University of Otago, Wellington, New Zealand. Adjunct A/Prof. Amanda Oakley, Dermatologist, Hamilton,  New Zealand. May 2020.


Go to the PO-PASI tool.

What is chronic plaque psoriasis?

Psoriasis is a skin disorder characterised by scaly red skin. Chronic plaque psoriasis is the most common form of psoriasis, in which there are persistent, symmetrical, erythematous, scaly plaques often located on scalp, trunk, and limbs. There can be few or many plaques, with varying redness, thickness and scale.

Chronic plaque psoriasis of varying severity

What is a PASI score?

PASI is an acronym for Psoriasis Area and Severity Index. The method has been widely adopted to provide health professionals with an approximate numerical way of describing a patient's chronic plaque psoriasis. The PASI score has been used in clinical trials of medications and to determine the eligibility for funded medications and the efficacy of treatment.

  • A PASI score of < 5 indicates mild chronic plaque psoriasis
  • A score of 5–10 represents moderate chronic plaque psoriasis
  • A score of > 10 describes severe chronic plaque psoriasis

The maximum PASI score is 72.

Go to the PO-PASI tool.

What is a patient-oriented PASI score?

The patient-oriented psoriasis area and severity index tool (PO-PASI) has been devised by DermNet for patients with chronic plaque psoriasis to help them estimate their own PASI score

How is the PO-PASI determined?

The PO-PASI score is automatically calculated.

The participant first selects the diagram or photograph that best resembles the area of skin affected by psoriasis in each of four body parts:

  • Head and neck
  • Trunk
  • Upper limb
  • Lower limb.

The participant also selects the photographs that most resemble the redness, thickness, and scaling of psoriasis plaques in each of the four body parts. The tool then creates a certificate which includes the total score.

How is the PO-PASI useful?

The PO-PASI is useful for remote assessment of a patient by a dermatologist or other health professional to determine the best treatment and whether the treatment has proved effective. The patient can also maintain their own clinical record.

Has the PO-PASI been validated? 

The PO-PASI was compared against PASI in 97 adults with chronic plaque psoriasis with a strong correlation and the results have been published in the peer reviewed literature [1]. Dermatologists can confidently use the tool to help manage patients with psoriasis during teledermatology consultations.

Go to the PO-PASI tool.



  1. Montes de Oca Pedrosa A, Oakley A, Rogers J, Rangaitaha Epiha M. PASI vs PO-PASI: Patient-Oriented PASI (PO-PASI) is comparable to clinician score PASI [published online ahead of print, 2021 Nov 10]. Australas J Dermatol. 2021;10.1111/ajd.13738. doi:10.1111/ajd.13738. PubMed

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