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 how often the oral ulcers come back, plus some of the other features noted above.
In order to make a diagnosis, it is necessary to rule out other illnesses that may also produce mouth sores and imitate Behçet's disease, such as systemic lupus, Crohn's disease (an inflammatory condition of the intestines) and other forms of vasculitis. HLA B 51 is a genetic marker that can sometime be present in patients with Behçet's syndrome.