Usually, a doctor can diagnose psoriatic arthritis based on your symptoms and a physical examination. In contrast to lupus or rheumatoid arthritis, autoantibodies are not usually present in the blood. Your doctor may order X-rays of the affected joints, but X-rays don't always indicate what type of arthritis you have. In a few cases, the X-rays may give the radiologist a clue that you have psoriatic arthritis rather than rheumatoid arthritis or another type of arthritis.
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