Sodium Deficit in Hyponatremia

Amount of required sodium replenishment for the patient with hyponatremia

Sodium Deficit in Hyponatremia

Amount of required sodium replenishment for the patient with hyponatremia

Sodium Deficit in Hyponatremia

Amount of required sodium replenishment for the patient with hyponatremia

Sodium Deficit in Hyponatremia

Amount of required sodium replenishment for the patient with hyponatremia

1.Sex?
2.Normal patient weight?
3.Serum sodium concentration?
4.Desired sodium concentration?
Created by on 25/08/2019

By using this site you acknowledge that you have read, understand, and agree to be bound by our terms of use and privacy policy. All content and tools are for educational use only, are not meant to be a substitute for professional advice and should not be used for medical diagnosis and/or medical treatment.

About this Calculator

Hyponatremia is a common electrolyte disturbance frequently requiring fluid administration for correction to physiologic levels. Rapid correction can be dangerous for patients, leading to cerebral edema and osmotic demyelination among other complications.1 Determining a safe rate of fluid administration to prevent these issues relies on patient and fluid variables. The majority of cases of osmotic demyelination were originally thought to have taken place with daily sodium correction of greater than 12 mmol/L/day (0.5 mmol/L/hr); however, many experts advocate for a more conservative approach to correction, targeting 4-6 mmol/L/day with a maximum of 8 mmol/L/day.2

This calculator specifically addresses the total sodium deficit for a patient considering their total body water (TBW) alongside current and desired serum sodium levels. The calculation used for TBW is simplified, however many more complex equations integrating age and height exist in the literature.

Calculator for Sodium Deficit

Sodium Deficit (mEq) = Total body water (TBW) * (Desired sodium - Serum sodium

Whereby:

  • total body water = (normal weight in kg) * (% body water)
  • % body water is 0.6 in adult males, and 0.5 in adult females

References

Adrogue HJ, Madias NE.

Hyponatremia.

NEJM, 2000.

Sterns RH, Nigwekar SU, Hix JK.

The treatment of hyponatremia.

Semin Nephrol. 2009;29(3):282.

The Sodium Deficit in Hyponatremia calculator is created by QxMD.

1. Sex?

Created by on 25/08/2019

By using this site you acknowledge that you have read, understand, and agree to be bound by our terms of use and privacy policy. All content and tools are for educational use only, are not meant to be a substitute for professional advice and should not be used for medical diagnosis and/or medical treatment.

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