What's a Urine Culture?

Your doctor tells you she wants to do a urine culture. It’s a test to check for germs or bacteria in your pee that can cause a urinary tract infection (UTI).

Your urinary tract includes the kidneys, bladder, and the tubes that carry your pee (ureters and the urethra).

An infection usually starts in the bladder or urethra (the tube your pee comes out of). But it can affect any part of this system.

If you have an infection, there may be a burning feeling when you pee. Or, you may feel like you need to go, but nothing or very little comes out. If you also have a fever or belly pain, it may mean you have a more serious infection.

What Do I Do for a Urine Culture?

You pee in a cup. It sounds simple enough, and it is. Just make sure you get a “clean” urine sample so any germs found in it are from an infection in your urinary tract and not another source, like your skin.

Here’s how you do it:

  1. Wash your hands.
  2. Wipe the area around where you pee with the cleaning pad given to you. If you’re a woman, spread the outer lips of your vagina and clean from front to back. Men should wipe the tip of their penis.
  3. Pee a little in the toilet first and stop. Don’t pee in the cup right away. Then, collect about 1 or 2 ounces in the cup. Make sure the container doesn’t touch your skin. Finish peeing in the toilet. This is called a “midstream” urine catch.
  4. Wash your hands again.

Some people may need their sample collected through a catheter -- a thin tube put into your urethra and into the bladder. This is done with the help of a health care worker. The sample is placed in a clean container.

What Happens Next?

Your sample goes to a lab. Drops of your pee are put in a petri dish and stored at body temperature. Over the next few days, any bacteria or yeast in the sample will multiply and grow.

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A lab worker will look at the germs under the microscope. Their size, shape, and color tell which types are there. The lab worker will note how many are growing.

If there are no harmful germs, the culture is called “negative.” If there are bad germs growing, it’s “positive.” The most common thing that causes UTI’s is E-coli – bacteria that live in your intestines.

The lab may do more testing to see which drugs have the best chance of fighting the infection.

When Will I Get My Results?

Your doctor’s office will call in 1 to 3 days. She’ll go over the results with you.

If you have an infection, you’ll be given antibiotics. Most of the time, it goes away. But it may come back, especially if you’re a woman.

It’s important to take your medicine the way your doctor tells you to. An infection that starts in the bladder or urethra can spread to the kidneys and damage them.

WebMD Medical Reference Reviewed by William Blahd, MD on January 25, 2017

Sources

SOURCES:

American Association of Clinical Chemistry: “Urine Culture.”

National Institute of Diabetes and Digestive and Kidney Diseases: “Urinary Tract Infections (UTIs).”

U.S. Library of Medicine: “Understanding Urine Tests.”

Nemours Foundation: “Urine Test: Routine Culture.”

National Kidney Foundation: “Urinary Tract Infections.”

Harvard Medical School: “When Urinary Tract Infections Keep Coming Back.”

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