Calc Function

    • Calcs that help predict probability of a diseaseDiagnosis
    • Subcategory of 'Diagnosis' designed to be very sensitiveRule Out
    • Disease is diagnosed: prognosticate to guide treatmentPrognosis
    • Numerical inputs and outputsFormula
    • Med treatment and moreTreatment
    • Suggested protocolsAlgorithm

    Disease

    Select...

    Specialty

    Select...

    Chief Complaint

    Select...

    Organ System

    Select...

    Patent Pending

    Urine Output and Fluid Balance

    Calculates urine output over a 24-hour period.
    Favorite

    INSTRUCTIONS

    Include volume intake to get a net fluid balance calculation as well (assuming no other fluid losses), for both adult and pediatric patients.

    Pearls/Pitfalls
    Calculates urine output rate and fluid balance, comparing with normals, from total urine output and fluid intake.
    lbs
    mL
    hours
    mL

    Result:

    Please fill out required fields.

    Next Steps
    Evidence
    Creator Insights

    Advice

    Can be used to measure fluid balance as well as possible kidney injury. One definition (RIFLE consensus definition of the Acute Dialysis Quality Initiative) of risk of AKI being <0.5 cc/kg/hr for 6+ hours, injury of AKI if <0.5 cc/kg/hr for 12+ hours, and failure if <0.3 cc/kg/hr for 24+ hours (or anuric for 12 hours).

    Formula

    Urine output [cc/kg/hr] = Actual[cc/day] / (weight [kg]*24)

    Facts & Figures

    The normal range for 24-hour urine volume is 800 to 2000 milliliters per day (with a normal fluid intake of about 2 liters per day).

    • Oliguria is urine output < 500 mL in 24 h (0.5 mL/kg/h) in an adult.
    • Oliguria is urine output < 1 L in 24 h (1 mL/kg/h) in a child.
    Dr. Saulo Klahr

    About the Creator

    Saulo Klahr, MD, (d. 2010) was formerly the director of the Renal Division at Washington University. He received an award in 1994 from the American Association for the Advancement of Science for his research on the causes of kidney diseases and his leadership in the field of nephrology. His research focused on kidney disease and metabolism and regulatory control of fluids and electrolytes.

    To view Dr. Saulo Klahr's publications, visit PubMed