Not sure exactly how long they last if freezed or put in the fridge, but I have heard that it works. You can also dry out the sample and then collect the residue left over and when it comes time for your test just add water to the sample that is around body temp.
rnf232s Reviewed by rnf232s on . Urine Test Substitution I will be having to get a urine test in the near future, however, I do not know when. I was wondering If I get someoneâ??s clean urine and I refrigerate it/freeze it, how long will I be able to keep it/use it in a test before it goes bad? Please give me advice ASAP! Thanks Rating: 5