Urine concentration test

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Female urinary tract

Male urinary tract

Urine concentration test

Instructions will be given for water loading or water deprivation. The health care provider may advise you to withhold drugs that can affect the test.

If the collection is being taken from an infant, a couple of extra collection bags may be necessary.

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

Most often, a urine concentration test is performed when diabetes insipidus is suspected and to help differentiate it from nephrogenic diabetes insipidus.

SIADH (syndrome of inappropriate ADH ) -- a condition where urine concentrations are excessively high (water is conserved) given the person's degree of hydration -- is another condition where urine concentration values are helpful for diagnostic and therapeutic purposes.

Normally, the kidneys regulate the concentration of urine by adjusting the excretion of water. Water excretion is regulated, in part, by ADH (anti-diuretic hormone).

Review Date: 02/03/2006
Reviewed By: Charles Silberberg, DO, Private Practice specializing in Nephrology, Affiliated with New York Medical College, Division of Nephrology, Valhalla, NY. Review provided by VeriMed Healthcare Network.