Psoriasis Area and Severity Index (PASI)

How the Psoriasis Area and Severity Index Works

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The Psoriasis Area and Severity Index (PASI) helps in diagnosing psoriasis and judging whether a patient’s condition is improving.

The Psoriasis Area and Severity Index (PASI) is an assessment tool that doctors and nurses use to record the severity of a patient’s psoriasis the health condition defined by inflamed lesions and silver-colored plaques.

Physicians created the index in 1978 because they needed an objective means to measure the effectiveness of the drug Soriatane (acitretin), a psoriasis treatment. Since then, PASI has become a widely used method for diagnosing psoriasis severity and judging new psoriasis treatments, medications, and therapies.