Psoriasis Area and Severity Index (PASI)

• Higher PASI scores indicate more severe psoriasis and therefore likely warrant more aggressive treatment.

• May be trended over time to assess treatment efficacy.

When measured serially:

• The term “PASI 75” indicates a 75% reduction (improvement) in PASI, and is generally considered a “good response” to therapy.

• PASI 50 to 74 is considered partial response, and PASI <50 is considered treatment failure.

• Patients with PASI 75 can likely continue current management, and those with PASI <50 can be considered for more aggressive treatment such as with biologics.

• Consultation with a dermatologist is warranted in patients with psoriasis.

• PASI assessments become more reliable with experience in scoring.