Please be patient! It may take up to ONE minute to load all the Engines.
Problems? Please contact our support.
Sodium - urine
Alternative namesUrinary 24 hours sodium; Urine Na+
DefinitionThe sodium urine test measures the amount of sodium in urine.
How the test is performedUrine may be collected over a 24-hour period or by the "clean-catch" method. The urine is then analyzed by a laboratory.
If a 24-hour urine sample is needed, your 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.
The health care provider may advise you to discontinue drugs that can affect the test (see Special Considerations).
How the test will feelThe test involves only normal urination, and there is no discomfort.
Why the test is performed
The test is often used to determine hydration status and the kidney's ability to conserve or excrete sodium.
Aldosterone (see the aldosterone test), a hormone produced by the adrenal gland, plays a major role in regulating sodium levels within the body and urine. Specifically, aldosterone increases the reabsorption of sodium in the kidneys at the expense of potassium and hydrogen loss.
Reabsorption of sodium helps retain water in body tissues and the blood stream. This way, aldosterone helps maintain plasma volume and blood pressure. Dehydration and conditions that decrease kidney blood flow stimulate aldosterone production.
Normal ValuesNormal values are generally 15 to 250 mEq/L/day, depending on hydration status and daily intake of dietary sodium. Normal value ranges may vary slightly among different laboratories.
Note: mEq/L/day = milliequivalents per liter per day
What abnormal results mean
Greater-than-normal urine sodium levels may indicate excessive salt intake.
Lower-than-normal urine sodium levels may indicate:
What the risks areThere are no risks.
Special considerationsDeficient or excessive amounts of sodium in the diet may affect test results.
Drugs that can increase test measurements include some antibiotics, diuretics, prostaglandins, and certain corticosteroids.
Drugs that can decrease test measurements include NSAIDs.
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