Urine Culture

What is a urine culture?

A urine culture is a test done on a sample of your urine to see if infection-causing organisms are in the urine. If the test is positive, your health care provider can use the information to prescribe medicine to treat the infection.

Why is this test done?

A urine culture is done to diagnose or confirm an infection in the urinary tract (the kidneys, bladder, or urethra, which is the tube that drains urine out of the body).

How do I prepare for this test?

• You may need to avoid taking certain medicines before the test because they might affect the test result. Make sure your health care provider knows about any medicines, herbs, or supplements that you are taking.

How is the test done?

There are two methods for collecting a urine specimen: the clean-catch method and the catheterization method.

• For the clean-catch method, you clean your genital area, start urinating, and then catch some of the urine in a cup.

  For more information, see:

  Clean-Catch Urine Sample (Women)

  Clean-Catch Urine Specimen (Men)

• The catheterization method may be used if you have trouble with the clean-catch method or if a sample is needed from an infant or young child. In the catheterization method a health care provider cleans the genital area and then passes a thin flexible tube into the urethra and up to the bladder to collect a sample of urine.

The sample of urine is sent to a lab to see if any bacteria grow from it.

How will I get the test result?

Ask your heath care provider when and how you will get the result of your test. It usually takes 2 to 4 days for the urine culture result to be complete.

What does the test result mean?

A negative, or normal, test result means no bacteria grew in the culture and you probably do not have an infection.

Usually a positive test result means you have a urinary tract infection. However, the result could be positive when you don't have an infection if too many bacteria from your skin got into the sample.

What if my test result is not normal?

Test results are only one part of a larger picture that takes into account your medical history and current health. Sometimes a test needs to be repeated to check the first result. Talk to your health care provider about your result and ask questions.

If your test result is not normal, ask your health care provider:

• if you need additional tests
• what you need to do to have a normal value
• when you need to be tested again.