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Urine 24-hour volume
Alternative namesUrine volume; 24-hour urine collection
DefinitionA urine 24-hour volume tests the amount of urine produced in a day.
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.
Drink a normal volume of fluids, and consume a normal diet.
How the test will feelThe test involves only normal urination, and there is no discomfort.
Why the test is performedUrine volume is normally measured as a part of the creatinine clearance test, or any test that measures the amount of a substance eliminated in a day (for example, protein, aldosterone, sodium, potassium, urea nitrogen). It is also measured in patients with polyuria (abnormally large volumes of urine), such as diabetes insipidus .
800 to 2000 ml/day (with a normal fluid intake of about 2 L/day)
Normal value ranges may vary slightly among different laboratories.
What abnormal results meanDisorders that cause reduced urine volume include dehydration, inadequate fluid intake, or renal insufficiency or failure.
Some of the conditions that cause increased urine volume include:
What the risks areThere are no risks, except for the chance of inaccurate results if all of the urine is not collected during the 24-hour period.
Special considerationsNot applicable.
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