Testing and Diagnosis for Psoriatic Arthritis
Psoriatic arthritis (PSA) is a condition that affects people who have psoriasis, an immune system disorder that appears as reddish or silvery skin lesions. Symptoms of PSA include periodic inflammation of the joints and body tissues, including the heart, eyes, kidneys, lungs, and spine. A person may have symptoms of one condition alone for many years before signs of the accompanying condition show up
Diagnosing PSA can be somewhat complicated, as there is currently no specific test for the condition. There are, however, several approaches to diagnosis. When indicators of PSA surface, a blood test is often used to rule out rheumatoid arthritis. This test is negative in almost all cases in which PSA is present.