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    • Subcategory of 'Diagnosis' designed to be very sensitiveRule Out
    • Disease is diagnosed: prognosticate to guide treatmentPrognosis
    • Numerical inputs and outputsFormula
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    Patent Pending

    Body Fluid Balance Calculator by Inputs and Outputs

    Calculates fluid balance from sodium concentrations which indicate net 0.9% saline, and free water losses (GI, urine, etc) and gains (IV fluids, PO, etc).

    INSTRUCTIONS

    All entries for fluids and solutions should be entered as positive numbers.

    When to Use
    Pearls/Pitfalls
    Why Use

    Hospitalized patients with parenteral and/or enteral intake.

    • Normal saline may not always be the most appropriate replacement fluid, depending on the clinical scenario (see Next Steps for details).

    • Water has a minimal effect on volume in decompensated heart failure, but does cause changes in serum sodium concentrations (Konstam 2007).

    • Daily changes in total body weights and total intakes and outputs do not correlate (Testani 2015) and include both volume and water components, making those measures less accurate for assessing fluid balance.

    • Calculating net changes in volume and water may allow for better management of volume status and changes in serum sodium concentrations.

    Body fluid LOST (enter as positive numbers, e.g. 100 mL, not -100 mL)
    mL
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    Parenteral (IV) solutions administered
    mL
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    mL
    mL
    mL
    mL
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    mL
    Enteral solutions administered
    mL
    mL
    mL
    mL
    mL
    mL
    mL
    mL
    mL
    mL
    mL
    mL
    mL
    mL
    mL
    mL
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    mL
    mL

    Result:

    Please fill out required fields.

    Next Steps
    Evidence
    Creator Insights
    Dr. Elaine Kaptein

    About the Creator

    Elaine M. Kaptein, MD, is a professor of medicine at University of Southern California Keck School of Medicine in Los Angeles. She is a board certified endocrinologist and nephrologist and a member of the American Society of Nephrology. Dr. Kaptein’s primary research is currently focused on bedside inferior vena cava ultrasound to assess volume management in hospitalized patients.

    To view Dr. Elaine Kaptein's publications, visit PubMed

    Are you Dr. Elaine Kaptein? Send us a message to review your photo and bio, and find out how to submit Creator Insights!
    MDCalc loves calculator creators – researchers who, through intelligent and often complex methods, discover tools that describe scientific facts that can then be applied in practice. These are real scientific discoveries about the nature of the human body, which can be invaluable to physicians taking care of patients.
    Dr. Matthew J. Kaptein

    About the Creator

    Matthew J. Kaptein, MD, is a practicing nephrologist and assistant professor of medicine at the Loma Linda University in Loma Linda, California. Dr. Kaptein’s primary research is focused on effect of ultrafiltration volume in hemodialysis patients.

    To view Dr. Matthew J. Kaptein's publications, visit PubMed

    Are you Dr. Matthew J. Kaptein? Send us a message to review your photo and bio, and find out how to submit Creator Insights!
    MDCalc loves calculator creators – researchers who, through intelligent and often complex methods, discover tools that describe scientific facts that can then be applied in practice. These are real scientific discoveries about the nature of the human body, which can be invaluable to physicians taking care of patients.
    Content Contributors
    About the Creator
    Dr. Elaine Kaptein
    Are you Dr. Elaine Kaptein?
    Dr. Matthew J. Kaptein
    Are you Dr. Matthew J. Kaptein?
    Content Contributors