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A 22-year-old member asked:

Why is creatinine measured in a 24 hour urine collection?

2 doctor answers5 doctors weighed in
Dr. George Klauber
Specializes in Pediatric Urology
Tell kidney function: Single urine specimens can be tested for creatinine. But daily urine output and urinary concentration varies hence a 24 hr urine collection. Normal creatinine output for an adult should be >1gm/24 hours. Also getting blood creatinine provides optimal way to accurately determine creatine clearance which in turn is a most accurate way to measure kidney function.
Dr. Alok Agrawal
Nephrology and Dialysis 34 years experience
Cr clearance: To check creatinine clearance which is the function of the kidney. Also to check if urine was appropriately collected for 24 hours.

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Last updated Jan 6, 2013

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