How is Behçet's disease diagnosed?

How is Behçet's disease diagnosed?

There is no single laboratory test that can diagnose Behçet’s disease. The diagnosis is usually made based on your symptoms, including how often (typically at least three times a year) oral ulcers come back. Plus, at least two more of the following:

• Genital sores.
• Eye inflammation.
• Skin problems
• A positive pathergy test (a pathergy test tests the immune system’s functionality; it’s performed by pricking the skin and then checking to see if a red bump develops a few days after the test).

To make the correct diagnosis, other illnesses that produce mouth sores and closely resemble Behçet's disease need to be ruled out. Your doctor may order a blood test, which can help rule out some of these other conditions, including systemic lupus, Crohn's disease (an intestinal inflammatory condition) and other forms of vasculitis.