Sodium Deficit in Hyponatremia
Sodium Deficit in Hyponatremia
kg
mEq/L
mEq/L
Sodium Deficit:
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–
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Calculates sodium quantity missing in hyponatremia.
Why Use
Estimates the total amount of sodium that needs to be replaced in hyponatremia patients.
Formula
Sodium deficit = total body water × (desired Na - pt's Na) For adults, total body water (TBW) is calculated using the Watson equation: Men: TBW, liters = 2.447 – 0.09516 × age, years + 0.1074 × height, cm + 0.3362 × weight, kg Women: TBW, liters = -2.097 + 0.1069 × height, cm + 0.2466 × weight, kg For children, TBW = 0.6 × weight, kg
Advice
Correct hyponatremia carefully. Do not forget to correct the hyponatremia level in hyperglycemic patients with the Sodium Correction for Hyperglycemia calculator . Use with the Sodium Correction Rate in Hyponatremia calculator which estimates the rate to correct, as well as tonicity of the solution used. Typically hypertonic solutions are reserved for patients that are overly symptomatic, such as seizures and severe neurologic deficits.
More Information
Remember not to correct too rapidly to avoid central pontine myelinolysis! The hyponatremia correction rate calculator can be used to pick an appropriate fluid and volume as well.