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Creatinine - urine

Contents of this page:

Illustrations

Female urinary tract
Female urinary tract
Male urinary tract
Male urinary tract
Creatinine tests
Creatinine tests
Creatinine urine test
Creatinine urine test

Alternative Names    Return to top

Urine creatinine test

Definition    Return to top

Creatinine is a breakdown product of creatine, which is an important part of muscle. Creatinine is removed from the body entirely by the kidneys. A test can be done to measures the amount of creatinine in your urine.

A blood test can also be used to determine your creatinine level. See: Serum creatinine

How the Test is Performed    Return to top

A random urine sample or a 24-hour collection may used.

If a 24-hour urine sample is needed:

For an infant, thoroughly wash the area around the urethra. Open a urine collection bag (a plastic bag with an adhesive paper on one end), and place it on the infant. For males, place the entire penis in the bag and attach the adhesive to the skin. For females, place the bag over the labia. Diaper as usual over the secured bag.

This procedure may take a couple of attempts -- lively infants can move the bag, causing the urine to be absorbed by the diaper. Check the infant frequently and change the bag after the infant has urinated into it. Drain the urine from the bag into the container provided by your health care provider.

Deliver it to the laboratory or your health care provider as soon as possible upon completion.

How to Prepare for the Test    Return to top

No special preparation is necessary, but if the sample is being taken from an infant, a couple of extra collection bags may be necessary.

Your health care provider may tell you to temporarily stop taking certain medicines that may interfere with test results. Such medicines include:

How the Test Will Feel    Return to top

The test involves only normal urination, and there is no discomfort.

Why the Test is Performed    Return to top

This test can be used as a screening test to evaluate kidney function. It may also be used as part of the creatinine clearance test.

Normal Results    Return to top

Urine creatine (24-hour sample) values can range from 500 to 2000 mg/day. Results are highly dependent on your age and amount of lean body mass.

Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

What Abnormal Results Mean    Return to top

Abnormal results of urine creatinine and creatinine clearance are often nonspecific, but may be due to any of the following conditions:

Risks    Return to top

There are essentially no risks.

Update Date: 10/22/2007

Updated by: Robert Mushnick, M.D., Clinical Assistant Professor, Department of Nephrology, SUNY Downstate Health Center, Brooklyn, NY. Review provided by VeriMed Healthcare Network.

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