Fear has it that the pH could have been thrown off by raising and lowering the heat of the urine and by occasionaly opening the cap to check temp.
This would not have any effect on any of the urine constituents being tested. The only time temp has any effect is if the urine sample was brought to a boil.

And theres no sensible reason to bring a urine sample to a boil when the acceptable temp range is 90-100F.