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Water Loading Test of the Syndrome of Inappropriate ADH (SIADH)

Specialty:

Endocrinology
Clinical Laboratory

Objective:

ICD-10:

Description:

Normally a person excretes a water load within a few hours, with decreases in serum and urine osmolality. Persons with abnormal ADH secretion can only partially excrete the water load and do not show the expected decrease in osmolality in either serum or urine. This test is useful in patients with serum sodium and osmolality near normal or normal and who are suspected of having SIADH.

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