Urine culture

Most of the time, the sample will be collected as a clean catch urine sample in your health care provider's office or your home. You will use a special kit to collect the urine. A urine sample can also be taken by inserting a thin rubber tube (catheter) through the urethra into the bladder. This is done by someone in…

If possible, collect the sample when urine has been in your bladder for 2 to 3 hours.

When the catheter is inserted, you may feel pressure. A special gel is used to numb the urethra.

Your provider may order this test if you have symptoms of a urinary tract infection or bladder infection, such as pain or burning when urinating. You also may have a urine culture after you have been treated for an infection. This is to make sure that all of the bacteria are gone.

"Normal growth" is a normal result. This means that there is no infection. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your provider about the meaning of your specific test results.

A "positive" or abnormal test is when bacteria or yeast are found in the culture. This likely means that you have a urinary tract infection or bladder infection. Other tests may help your provider know which bacteria or yeast are causing the infection and which antibiotics will best treat it, if treatment is needed.…

There is a very rare risk for a hole (perforation) in the urethra or bladder if your provider uses a catheter.

You may have a false-negative urine culture if you have been taking antibiotics.

Cooper KL, Badalato GM, Rutman MP. Infections of the urinary tract. In: Partin AW, Dmochowski RR, Kavoussi LR, Peters CA, eds. Campbell-Walsh-Wein Urology . 12th ed. Philadelphia, PA: Elsevier; 2021:chap 55. Nicolle LE, Drekonja D. Approach to the patient with urinary tract infections. In: Goldman L, Schafer AI, eds.…