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Thread: What is his GFR

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    What is his GFR

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    A 45-year-old woman is hospitalized after an automobile accident.
    The physician collects 1.44 L of urine from the patient in a
    24-hour period. The clinical lab returns the following results:
    Plasma creatinine concentration 2.0 mg/mL
    Plasma urea concentration 15 mmol/mL
    Urine creatinine concentration 100 mg/mL
    Urine urea concentration 160 mmol/mL
    What is the approximate glomerular filtration rate (GFR; in mL/min)
    of this patient?

    A. 10
    B. 25
    C. 50
    D. 75
    E. 100

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    answer is D

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    where is the explanation???

    Quote Originally Posted by Hussam
    answer is D
    explain please?

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    Re: What is his GFR

    Quote Originally Posted by Anonymous
    A 45-year-old woman is hospitalized after an automobile accident.
    The physician collects 1.44 L of urine from the patient in a
    24-hour period. The clinical lab returns the following results:
    Plasma creatinine concentration 2.0 mg/mL
    Plasma urea concentration 15 mmol/mL
    Urine creatinine concentration 100 mg/mL
    Urine urea concentration 160 mmol/mL
    What is the approximate glomerular filtration rate (GFR; in mL/min)
    of this patient?

    A. 10
    B. 25
    C. 50
    D. 75
    E. 100
    It should be C.

    1.44L/day X 100 mg/mL / 2.0 mg/mL = 72L/day = 72000mL/day

    72000mL/1440min = 50mL/min


    ANother trick is this:

    serum creatinine should be 1. For every doubling in creatinine, the GFR gets cut in half. If you couldnt figure it out, you could use this formula.

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