Gram stain of urethral discharge
How the test is performed:
A urethral discharge is collected on a cotton swab. A sample called a smear from the urethra is applied in a very thin layer to a microscope slide. The specimen is stained with a violet stain known as a gram stain, and then examined under the microscope for the presence of bacteria. The color, number, and morphologic appearance of the cells helps make it possible to identify the genus (type) of the organism present.
How to prepare for the test:
Adults:
There is no special preparation for the test. The test is often performed in the health care provider's office.
Infants and children:
The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:
How the test will feel:
The sensation of pressure or burning may be present when the cotton swab is in contact with the urethra.
Why the test is performed:
The test is performed when an abnormal urethral discharge is present. It may be performed if infection with a sexually transmitted disease is suspected.
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