HP 127
PASI calculator.
The Psoriasis Area and Severity Index
A
patient's Psoriasis Area and Severity Index (PASI) is a measure of overall
psoriasis severity and coverage. It is a commonly-used measure in clinical
trials for psoriasis treatments. Typically, the PASI would be calculated before,
during, and after a treatment period in order to determine how well psoriasis
responds to the treatment under test (a lower PASI means less psoriasis,
generally).
Not all PASIs are the same, however. In clinical trials, it is common that a "modified PASI" is used as the main measurement, and how "modified" it is will depend on the researchers and what they are looking for, specifically. The only way to learn exactly how the PASI has been modified is to read whatever study you're interested in, the entire measurement protocol should be written up in detail.