Definition
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.
Alternative Names
Culture of urethral discharge; Genital exudate culture; Culture - genital discharge or exudateHow the test is performed
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.
How to prepare for the test
Do not urinate for 1 hour before the test. Urination will wash away some of the organisms needed to obtain an accurate culture.
How the test will feel
There is usually some discomfort from swabbing the urethra.
Why the test is performed
Often the test is performed when there is a discharge from the urethra. This test can detect sexually transmitted diseases, such as gonorrhea and chlamydia.
Normal Values
A negative culture, or no growth appearing in the culture, is normal.
What abnormal results mean
Abnormal results can indicate infection within the genital system. These infections can include gonorrhea or chlamydia.
See also:
What the risks are
Fainting (caused by stimulation of the vagal nerve) occasionally occurs when the swab is introduced into the urethra. Other risks include infection or bleeding.
Special considerations
A comparable test for women and girls is an endocervical culture.
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