How is hyponatremia classified?

Updated: Jun 17, 2019
  • Author: Eric E Simon, MD; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Hyponatremia is classified according to volume status, as follows:

  • Hypovolemic hyponatremia: decrease in total body water with greater decrease in total body sodium

  • Euvolemic hyponatremia: normal body sodium with increase in total body water

  • Hypervolemic hyponatremia: increase in total body sodium with greater increase in total body water

Hyponatremia can be further subclassified according to effective osmolality, as follows:

  • Hypotonic hyponatremia

  • Isotonic hyponatremia

  • Hypertonic hyponatremia

See Presentation for more detail.

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