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Psoriatic Arthritis Diagnosis

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How Is Psoriatic Arthritis Diagnosed? continued...

When one or two large joints (such as knees) are inflamed, arthrocentesis can be performed. Arthrocentesis is an office procedure in which a sterile needle is used to withdraw (aspirate) fluid from the inflamed joints. The fluid is then analyzed for infection, gout crystals, and other inflammatory conditions.

X-rays may show changes of cartilage or bone injury indicative of arthritis of the spine, sacroiliac joints, or joints of the hands.  X-ray findings include bony erosions resulting from arthritis although they tend not to look the same as in rheumatoid arthritis

The blood test for the genetic marker HLA-B27 can be found in more than 50% of patients with psoriatic arthritis who have spine inflammation.

Because psoriatic arthritis may lead to bone loss, a bone density scan may be taken to measure bone strength and to assess which patients may be at risk for osteoporosis and fractures.

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WebMD Medical Reference

Reviewed by David Zelman, MD on September 06, 2014

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