What lab tests are used to evaluate hyponatremia?

Updated: Jun 17, 2019
  • Author: Eric E Simon, MD; Chief Editor: Vecihi Batuman, MD, FASN  more...
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There are three essential laboratory tests in the evaluation of patients with hyponatremia that, together with the history and the physical examination, help to establish the primary underlying etiologic mechanism. (In general, the etiology of the hyponatremia directs its management.) These tests are as follows

  • Urine osmolality

  • Serum osmolality

  • Urinary sodium concentration

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