electronic Self-Administered Psoriasis Area and Severity Index




Psoriasis self-assessment made easy and quick


What is the SA-PASI


The Self-Administered Psoriasis Area and Severity Index (SAPASI) is intended to measure the psoriasis severity by patients themselves. The SAPASI evaluates the area affected by psoriasis and captures its redness, thickness and scaliness. A regular SAPASI assessment may help to continuously monitor the progression of the disease.

How was the SA-PASI developed?


The SA-PASI was developed at the Bowman Gray School of Medicine of Wake Forest University in the USA. The SA-PASI is a modified version of the original PASI, which requires trained staff for the measurement. Instead of the calculation of the involved Body Surface Area (BSA) by trained personnel, a line-drawing silhouette of the front and back is marked by the patient to estimate the involved body area. In the electronic version of the SAPASI, the body surface area is calculated using the patient's palm, with one palm representing approximately 1% of the body surface area. This is done by four body regions (head, trunk, back and legs). Since its original development the SAPASI was validated in multiple studies and showed high agreement with the original and well accepted PASI. The electronic version of the SAPASI is currently validated at the Institute for Health Services Research in Dermatology and Nursing at the University Medical Center Hamburg Eppendorf. 


How to use the SA-PASI


The SAPASI is a measurement tool for self-assessment that can be filled out by the patient himself. The questionnaire is self-explanatory and consists out of two parts.


First, three questions, assessing the severity of a typical plaque by its redness, thickness and scaliness.


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Second, the affected area of the body is determined. The assessment is made with the help of the patient's palm. For each body region (head, trunk, back and legs), the number of palms that fit on the affected skin areas is counted. The final sum score is derived by a combination of the body area involved and the severity of an average plaque. The score is automatically calculated in the DermaTools application.


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Following you can find the versions of the eSA-PASI

esapasi pdf
esapasi pdf or

Plate XXIII, Psoriasis. Crocker 1896
Credit: Wellcome Library, London

About Psoriasis


Psoriasis is a long-lasting autoimmune disease known by its abnormal patches of skin (red, itchy and even scaly).


“Psoriasis is a chronic inflammatory disease, with an incidence in Western industrialized countries of 1.5 % to 3 %. It represents a great burden to the patient due to marked loss of quality of life, therapy-refractory course and frequent side effects of therapy.”


Prof. Dr. med. med. Matthias Augustin


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SA-PASI is intended to be used by a patient or a caregiver.

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Save your time with eSA-PASI. In only a few minutes you can get your SA-PASI score without doing any calculations.

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eSA-PASI is straightforward to use, thanks to the simple instructions and visual analogue scales.

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Since its original development the SA-PASI was validated in multiple studies and showed good agreement with the original and well accepted PASI.

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A regular SA-PASI assessment may help to continuously monitor the progression of the disease and determine the effect of a treatment.  

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Your eSA-PASI is always a couple of touches or clicks away, available on desktop, tablet, phone and other devices.



Fleischer AB Jr, Feldman SR, Dekle CL. The SAPASI is valid and responsive to psoriasis disease severity changes in a multi-center clinical trial. J Dermatol. 1999 Apr;26(4):210-5. doi: 10.1111/j.1346-8138.1999.tb03458.x. PMID: 10343464.

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