How is urine osmolality used in the diagnosis of hyponatremia?

Updated: Jun 17, 2019
  • Author: Eric E Simon, MD; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Urine osmolality helps differentiate between conditions associated with impaired free-water excretion and primary polydipsia. A urine osmolality greater than 100 mOsm/kg indicates impaired ability of the kidneys to dilute the urine.

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