Urethral discharge culture is a laboratory test done on men and boys to identify organisms in the urethra (the tube that drains urine from the bladder) and genital tract that cause infection.

To ensure a good quality specimen, it should be collected at least 1 hour after urinating.

The health care provider cleans the opening of the urethra (at the tip of the penis) with sterile gauze or cotton. A cotton swab is then gently inserted into the urethra about 3/4 inch and rotated.

A culture of the discharge or exudate (the fluid that was collected) is then prepared in the laboratory. The laboratory technician isolates and identifies any organisms that grow on the culture. The drainage may be examined on a slide under the microscope and then confirmed by culture.

Do not urinate for 1 hour before the test. Urination will wash away some of the organisms needed to obtain an accurate culture.

There is usually some discomfort from swabbing the urethra.