During the collection of urine for a 24 hour creatinine clearance, why does the urine need to be kept cool?

Question

During the collection of urine for a 24 hour creatinine clearance, why does the urine need to be kept cool?

Answer 1

Urine decomposes quickly and is great as a culture medium for organisms. If you keep the temperature down, as you know, extraneous specimens are less likely to proliferate, thus tainting the sample.