You Need to Evaluate Kidney Function in a 55-Year?-Old Obese

question 21

Multiple Choice

You need to evaluate kidney function in a 55-year?-old obese man with type 2 diabetes; you ask him to collect his urine over a 24-hour period. He collects 4,320 mL of urine. The clinical laboratory returns the following results from analysis of his urine and plasma samples: · Plasma creatinine = 3.0 mg/100 mL
· Urine creatinine = 40 mg/100 mL
· Plasma potassium = 5.0 mmol/L
· Urine potassium = 20 mmol/L

What is his approximate GFR, 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

---

Definitions:

Indwelling Urinary Catheter

A tube inserted into the bladder through the urethra to collect urine, often used for patients unable to urinate on their own.

Deflated

Feeling of being let down or reduced in spirit, morale, or volume, often used metaphorically to describe emotions.

Withdraw

The act of removing, taking back, or retreating from a position or situation.

Urinary Catheterization

The insertion of a catheter into the bladder through the urethra to drain urine, used for patients who cannot urinate naturally.