What is the role of urine osmolarity in the workup of hyponatremia?

Updated: Dec 28, 2018
  • Author: Kartik Shah, MD; Chief Editor: Romesh Khardori, MD, PhD, FACP  more...
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Answer

Urine osmolarity may be helpful in establishing the diagnosis of SIADH. Typically, patients with SIADH have inappropriately concentrated urine, with urine osmolarities in excess of 100 mOsm/L. Patients with other forms of hyponatremia and appropriately depressed levels of ADH have urine osmolarities below 100 mOsm/L.


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