Urine Concentration Test
Alternate Names : Water Deprivation Test, Water Loading Test
Definition A test that measures the ability of the kidneys to conserve or excrete water appropriately (see also Urine specific gravity).
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Why is the Test Performed?
Most often, a urine concentration test is performed when diabetes insipidus is suspected and to help differentiate central diabetes insipidus from nephrogenic diabetes insipidus.
SIADH (syndrome of inappropriate ADH ), a condition where urine concentrations are excessively high (water is conserved) given the state of an individuals 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).
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