In the creatinine clearance calculation example, the 24-hour urine volume was which value?

In the creatinine clearance calculation example, the 24-hour urine volume was which value?

• A. 1200 mL
• B. 1520 mL
• C. 2020 mL
• D. 2520 mL

Answer: (B)

Creatinine clearance depends on how much urine is produced over a 24-hour period, because the daily urine volume is the V in the clearance formula Cl_cr = (U_cr × V) / P_cr. The 24-hour urine volume represents the total amount of creatinine excreted in a day and scales the amount of creatinine being eliminated. In the example, the total 24-hour urine volume was 1520 mL, which sits in the typical daily range for adults (roughly 1 to 2.5 L). This volume, together with the measured urine creatinine concentration and the plasma creatinine, yields the calculated clearance. The other provided volumes would alter the result, but the example uses 1520 mL.

Creatinine clearance depends on how much urine is produced over a 24-hour period, because the daily urine volume is the V in the clearance formula Cl_cr = (U_cr × V) / P_cr. The 24-hour urine volume represents the total amount of creatinine excreted in a day and scales the amount of creatinine being eliminated. In the example, the total 24-hour urine volume was 1520 mL, which sits in the typical daily range for adults (roughly 1 to 2.5 L). This volume, together with the measured urine creatinine concentration and the plasma creatinine, yields the calculated clearance. The other provided volumes would alter the result, but the example uses 1520 mL.