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
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    Patent Pending

    Fractional Excretion of Urea (FEUrea)

    Determines the cause of renal failure. Similar to the FENa, but can be used on patients on diuretics.
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    Pearls/Pitfalls

    While lesser known than FENa, the FEUrea can be used in patients on diuretics, since urea excretion is not significantly affected by diuretics.

    mg/dL
    mg/dL
    mg/dL
    mg/dL

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    Evidence
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    Management

    In patients with acute kidney and suspected obstructive uropathy, consider bedside ultrasound to evaluate for hydronephrosis, bladder distention, etc. Empiric Foley catheter placement may also be valid in some settings, though it may also be associated with complications, and does not rule out ureteral obstructions above the bladder.

    About the Creator
    Dr. Andre A. Kaplan
    Dr. Orly F. Kohn
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