Quote Originally Posted by stones
Frozen urine can last 1-2 years. Urine at room temp. can last 3-4 days before developing bacteria that can compramize the sample. Of course there are always things that can be taken into consideration; exposure to light, exposure to air, validity of the test ect. but the 3-4 days thing is safe.
Actually, I wouldn't go much further than 1 year on frozen urine. At room temperature, urine begans to break down after about 8 hours and produces several chemical by products which can be detected. I don't recommend storing urine at room temperature for 3-4 days. I read someone kept it in a dark place for a couple of weeks for his PO test. If that piss test was a stick test that might fly but if it is sent to a lab, do not keep the urine at room temp. Urine can be stored for about 2 weeks in a refrigerator.