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Chapter 37: Estimating Renal Function

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AR is a 50-year-old Caucasian woman who is 63 in tall and weighs 165 lb. Her current serum creatinine is 1.6 mg/dL. What is her ideal body weight (IBW)?

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a. 125 lb

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b. 115 lb

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c. 135 lb

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d. 165 lb

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Answer b is correct.

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IBW (women) = 45.5 + 2.3 (3 in over 5 ft) = 52.4 kg × 2.2 lb/1 kg = 115 lb

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What is AR’s creatinine clearance as estimated by the Cockcroft-Gault equation?

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a. 41 mL/min

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b. 35 mL/min

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c. 50 mL/min

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d. 58 mL/min

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Answer b is correct.

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CrCl = [(140 − 50) × 52.4 kg /72 × 1.6 mg/dL] × 0.85 = ~35 mL/min

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What is AR’s GFR as estimated by the MDRD equation?

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a. 25 mL/min

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b. 35 mL/min

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c. 45 mL/min

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d. 55 mL/min

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Answer b is correct.

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GFR = 186 × 1.6−1.154 × 50−0.203 × 0.742 = ~36 mL/min

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TM is a 79-year-old African American man who is 71 in tall and weighs 254 lb. His current serum creatinine is 1.2 mg/dL. What is his ideal body weight (IBW)?

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a. 145 lb

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b. 156 lb

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c. 166 lb

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d. 254 lb

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Answer c is correct.

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IBW (man) = 50 + 2.3 (11 in over 5 ft) = 75.3 kg × 2.2 lb/1 kg = 166 lb

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What is TM’s creatinine clearance as estimated by the Cockcroft-Gault equation?

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a. 69 mL/min

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b. 45 mL/min

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c. 81 mL/min

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d. 53 mL/min

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Answer d is correct.

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CrCl = (140 − 79) × 75.3 kg /72 × 1.2 mg/dL = ~53 mL/min

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What is TM’s ...

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