Psoriatic arthritis is a type of arthritis that often occurs with psoriasis - a common, chronic skin condition that causes red patches on the body.

Although not everyone with psoriasis will develop arthritis, this Psoriatic Arthritis Screening Questionnaire (PASQ) can help detect the presence of arthritis in patients suffering from psoriasis. Diagnostic screening tools such as the PASQ can encourage early management of conditions that would otherwise remain undiagnosed. This tool is one of the first medical applications on the App Store that has been tested and proven in a clinical environment.

The PASQ is composed of a diagram (where patients mark areas of pain and swelling) and 10 questions, which makes it easy to use and understand for both patients and physicians. The final score indicates whether the person has a high probability of having psoriatic arthritis. Those who have a positive result from the screening test will need further evaluation with subsequent diagnostic tests or procedures.