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Chapter 33. Estimating Renal Function

BG is a 50-year-old African American woman who is 63 in tall and weighs 130 lb. Her current SCr is 1.6 mg/dL.

What is BG’s IBW?

a. 125 lb

b. 115 lb

c. 135 lb

d. 165 lb

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

BG is a 50-year-old African American woman who is 63 in tall and weighs 130 lb. Her current SCr is 1.6 mg/dL.

What is BG’s CrCl as estimated by the Cockcroft-Gault equation?

a. 41 mL/min

b. 35 mL/min

c. 50 mL/min

d. 58 mL/min

Answer b is correct. CrCl = [(140 − 50) × 52.4 kg /72 × 1.6 mg/dL] × 0.85 = 35 mL/min

BG is a 50-year-old African American woman who is 63 in tall and weighs 130 lb. Her current SCr is 1.6 mg/dL.

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

a. 25 mL/min

b. 35 mL/min

c. 45 mL/min

d. 55 mL/min

Answer b is correct. GFR = 186 × 1.6−1.154 × 50−0.203 × 0.742 = 36 mL/min

GS is a 79-year-old African American man who is 71 in tall and weighs 190 lb. His current SCr is 1.2 mg/dL.

What is GS’s IBW?

a. 145 lb

b. 156 lb

c. 166 lb

d. 254 lb

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

GS is a 79-year-old African American man who is 71 in tall and weighs 190 lb. His current SCr is 1.2 mg/dL.

What is GS’s CrCl as estimated by the Cockcroft-Gault equation?

a. 69 mL/min

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