Evaluation of diagnostic ('classification') criteria in Behçet's disease--towards internationally agreed criteria. The International Study Group for Behçet's disease.

No fewer than five sets of diagnostic criteria for Behçet's disease are currently in use. The International Study Group have therefore undertaken an extensive study of existing criteria and have developed recommended new international criteria based on the collection of data from 914 patients with Behçet's disease and controls, of whom 886 (97%) and 97 respectively had mouth ulceration. It is recommended that these new criteria should replace the existing criteria sets although further studies are required to evaluate their performance in new patient groups.