Modifying PEST for Psoriatic Arthritis Screening

The purpose of this study is to assess the impact of adding two questions and pictures to the validated PEST on the potential diagnosis of PsA in participants with moderate-to-severe plaque PsO in Canada.

Key inclusion criteria: 1. Moderate-to-severe plaque PsO patients who are candidates for bDMARDs, according to physician's clinical judgement at the time of patient enrollment. 2. Adult patients at the time of informed consent signature 3. Patients able to understand and willing to comply with protocol requirements, instructions, and restrictions 4. Residents of Canada Key exclusion criteria: 1. Patients who have previously screened positive for PsA through PEST. 2. Patients who have been diagnosed with PsA. 3. Patients who have been diagnosed with inflammatory arthritis unrelated to PsA (rheumatoid arthritis, reactive arthritis, enteropathic arthritis, axial spondyloarthritis) 4. Patients treated with a bDMARD for moderate-to-severe plaque PsO or any other medical condition within the last 6 months prior to patient enrollment.