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Uric acid - urine
DefinitionThe uric acid urine test measures the amount of uric acid in 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 testThe health care provider may advise you to discontinue drugs that can affect the test (see "special considerations").
If the collection is being taken from an infant, a couple of extra collection bags may be necessary.
How the test will feelThe test involves only normal urination, and there is no discomfort.
Why the test is performed
The most common reason for measuring uric acid levels is for evaluation, diagnosis, and treatment of kidney stones. Patients with gout may also be evaluated using this test, since a significant number of patients with gout develop uric acid kidney stones.
Uric acid is the end-product of purine catabolism. Purines (such as adenine and guanine) are components of nucleotides, which are the building blocks of the nucleic acids such as RNA and DNA.
Normal ValuesNormal values range from 250 to 750 mg/24 hours. Normal value ranges may vary slightly among different laboratories.
Note: mg/24 hr = milligrams per 24 hours
What abnormal results mean
Abnormal results are indicated as follows:
Greater-than-normal urinary uric acid levels may indicate:
Lower-than-normal urinary uric acid levels may indicate:
Special considerationsInterfering factors for this test include:
Update Date: 2/11/2004Irfan A. Agha, M.D., Department of Medicine, Renal Division, St. Louis University, St. Louis, MO. Review provided by VeriMed Healthcare Network.
Last updated: Tue, 06 Jan 2009 00:20:03 GMT