An audit of the 'two-glass' test for urethritis.

Five hundred consecutive male patients with suspected urethritis were studied using the two-glass test for posterior urethritis. During the study period no cases of urethritis would have been missed using one glass only and clinical policy was changed following this audit. The two-glass test is traditionally used in genitourinary medicine clinics but we are unable to find evidence of a scientific basis for its use.