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Urea nitrogen - urine
Alternative namesUUN; Urine urea nitrogen
DefinitionA urea nitrogen urine test measures the amount of urea in the urine.
How the test is performedA 24-hour urine sample is needed.
The health care provider will instruct you, if necessary, to discontinue drugs that may interfere with the test.
This procedure may take a couple of attempts -- lively infants can displace the bag, causing the specimen to be absorbed by the diaper. The infant should be checked frequently and the bag changed after the infant has urinated into the bag. The urine is drained into the container for transport to the laboratory.
How to prepare for the testNo special preparation is necessary for this test, but if the collection is being taken from an infant, a couple of extra collection bags may be necessary.
How the test will feelUrinate in the normal manner, but collect all the urine in the container provided.
Why the test is performedThis test is mainly used to assess the protein balance and the amount of dietary protein needed by severely ill patients. Urine urea serves this purpose as it is a measure of protein breakdown in the body.
Urea is excreted by the kidneys, so excretion of urea can reflect kidney function. The urine urea excretion can be measured to obtain a ratio between the plasma (blood) urea and the urine urea. This ratio (U/P urea) is an indicator of how well the kidneys are able to filter and excrete urea from the bloodstream.
Normal ValuesNormal values range from 6 to 17 gm/24 hours or (60 to 90 mg/dl). Normal value ranges may vary slightly among different laboratories.
Note: gm/24 hours = grams per 24 hours; mg/dl = milligrams per deciliter
What abnormal results mean
Abnormal results are indicated as follows:
Low levels usually indicate:
What the risks areThere are no risks associated with testing urine urea.
Update Date: 2/11/2004Andrew Koren, M.D., Department of Nephrology, NYU-Mount Sinai Medical Center, New York, NY. Review provided by VeriMed Healthcare Network.
Last updated: Tue, 06 Jan 2009 00:20:03 GMT