The GFRs for a 91-year-old woman who weighs 93 pounds and is 5'1" with a serum creatinine of 1.1, and for a 202-pound, 25-year-old male who is 5'9" with the same serum creatinine according to the Cockcroft Gault formula are:
1. 25ml/ min and 133 mL/min respectively
2. 25 mL/min and 103 mL/min respectively
3. 22 ml/min and 133 mL/min respectively
4. 22 ml/min and 103 mL/min respectively
ANS: 2
RAT: Remember to use ideal body weight (IBW) in the formula. The woman's IBW is 105 pounds and the man's is 156 pounds. Note the huge difference in GFR based on weight and age and the fact that looking at the serum creatinine alone can be very misleading in predicting GFR.
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