AAFCS HNFS Practice Exam

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A 24-hour urine collection contains 1,440 mL. Urine creatinine is 120 mg/dL and serum creatinine is 1.5 mg/dL. What is the approximate creatinine clearance without body-surface-area correction?

72 mL/min 80 mL/min 48 mL/min 96 mL/min

Correct Answer:

80 mL/min

Explanation:

Urine flow is 1,440 mL / 1,440 min = 1.0 mL/min. Creatinine clearance = UCr x V / SCr = 120 x 1.0 / 1.5 = 80 mL/min.

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