A 60-year-old man weighs 70 kg and has serum creatinine 1.2 mg/dL. Using Cockcroft-Gault, what is his estimated creatinine clearance (mL/min)?
Answer and explanation
Correct answer: B. 65 mL/min
- Step 1: Cockcroft-Gault for men: CrCl = (140 - age) x weight / (72 x creatinine).
- Step 2: CrCl = (140 - 60) x 70 / (72 x 1.2) = 65 mL/min.
Answer
65 mL/min.
Why not the others: '55 mL/min' applies the female correction factor of 0.85 to a man; '49 mL/min' uses age instead of 140 minus age; '130 mL/min' doubles the estimate.
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