Diagnosis
A diagnosis of psoriatic arthritis is made on the basis of the patient's medical history (i.e., a history of psoriasis), physical examination, and diagnostic tests. In patients who have psoriasis, involvement of the fingernails (e.g., development of ridges and pits) may be suggestive of future psoriatic arthritis development.
Laboratory tests that may be performed include erythrocyte sedimentation rate (ESR) and C-reactive protein level. Elevated levels in these tests indicate inflammation in the body. Fluid within the joints (called synovial fluid) also may be tested to detect inflammation.
In September 2009, a genetic test for psoriatic arthritis (i.e., PsoriasisDX™ Genetic Test) was developed and launched. This test, which involves taking a genetic sample from the inside of the cheek, may help physicians identify patients with psoriasis who are at increased risk for developing psoriatic arthritis. Prompt diagnosis and treatment can reduce inflammation and help prevent joint damage associated with psoriatic arthritis.
Imaging tests (e.g., x-rays, CT scan, MRI scan) of the hands, feet, spine, and sacroiliac joint may be performed. These tests are used primarily to detect bone erosion and new bone formation, which may be present in some types of severe psoriatic arthritis.
Physician-developed and -monitored.
Original Date of Publication: 15 Jun 2006
Reviewed by: Stanley J. Swierzewski, III, M.D.
Last Reviewed: 04 Dec 2007
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