Evaluation of Kidney Function in a 46-Year-Old Obese Man with Type

Multiple Choice

Evaluation of kidney function in a 46-year-old obese man with type 2 diabetes reveals the following: · Urine volume = 5760 mL of urine, collected over the preceding 24 hours
· Plasma creatinine = 3 mg/100 mL
· Urine creatinine = 30 mg/100 mL
· Plasma potassium = 4.0 mmol/L
· Urine potassium = 20 mmol/L

What is his approximate glomerular filtration rate, assuming that he collected all of his urine in the 24-hour period?

A) 10 mL/min
B) 20 mL/min
C) 30 mL/min
D) 40 mL/min
E) 80 mL/min