Table 3.

International Study Group Diagnostic Criteria for Behçet Disease

Criterion	Description
Recurrent oral ulcerations	Minor or major aphthous ulcerations or herpetiform ulcerations observed by a physician or patient that have recurred at least 3 times in a 12-month period
Plus 2 of the following criteria in the absence of other clinical explanations:
Recurrent genital ulcerations	Aphthous ulcerations or scarring observed by a physician or patient
Eye lesions	Anterior or posterior uveitis or vitreous cells seen on slit-lamp examination; retinal vasculitis observed by an ophthalmologist
Skin lesions	Erythema nodosum observed by a physician or patient; pseudofolliculitis; papulopustular lesions; acneiform nodules observed by a physician in postadolescent patients who are not taking corticosteroids
Positive results from a pathergy test	Oblique insertion of a 20—22-gauge needle 5 mm into the skin, causing a papule 2 mm or larger. The test is generally performed on the forearm, and results are read by a physician after 24–48 hours.

Adapted from International Study Group for Behçet's Disease.²⁶