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    Sodium Deficit in Hyponatremia

    Calculates sodium quantity missing in hyponatremia.
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    Why Use

    Estimates the total amount of sodium that needs to be replaced in hyponatremia patients.

    mEq/L
    mEq/L
    lbs

    Result:

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    Next Steps
    Evidence
    Creator Insights

    Advice

    Correct hyponatremia carefully. Do not forget to correct the hypoonatremia 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.

    Formula

    Sodium deficit = Total body water * (desired Na - pt's Na) (TBW = 0.6 if male and 0.5 if female)

    Total Body Water (TBW) varies depending on age range

    • TBW (Adult Male) = 0.6 x weight (kg)
    • TBW (Adult Female) = 0.5 x weight (kg)
    • TBW (Elderly Male) = 0.5 x weight (kg)
    • TBW (Elderly Female) = 0.45 x weight (kg)
    • TBW (Child) = 0.6 x weight (kg)

    Facts & Figures

    Remember not to correct too rapidly to avoid central pontine myelinolysis!

    You can use the hyponatremia correction rate calculator to pick an appropriate fluid and volume as well.

    Dr. Nicolaos E. Madias

    About the Creator

    Nicolaos E. Madias, MD is the chair of the department of medicine at the St. Elizabeth's Medical Center and a professor of medicine, specializing in Nephrology, at Tufts University School of Medicine. He has co-authored over 100 articles published in peer reviewed journals.

    To view Dr. Nicolaos E. Madias's publications, visit PubMed