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WHAT IS WATER LOADING TEST?

WHAT IS WATER LOADING TEST?

The water loading test involves administering a large quantity of water and then comparing the osmolality of timed urine and serum collections. In a normal client, increased fluid intake increases urine output and decreases urine osmolality. In clients with SIADHS, however, excess secretion of the antidiuretic hormone causes a lower-than-normal urine output in response to the water loading and a urine osmolality that does not decrease below serum osmolality. 

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