As long as the sub donor was known to be drug-free (that includes scripted/OTC meds), and had not consumed a large volume of fluids prior to giving you the sample, you have nothing to worry about.

And as long as you didnt spike your sample with adulterants containing nitrites, chromium, or glutaraldehyde, then you have nothing to worry about. The use of other forms of adulterants will cause an abnormal pH.

Frozen urine stays "good" for up to 12 months.
Burnt Toast Reviewed by Burnt Toast on . Drug test question? Just took a pre employment test and I was going to use the method on the dillution thread so I followed it to a T and after takeing ten times the daily recomended dose of b12 my pee was still as clear as a mountian stream. I went with plan B and used methods described in substitution thread and seemed to have worked she accepted the pee so I will have to wait and see how it turned out. I was curious why they take a sample to look at under a michroscope??? And why wouldnt my pee turn yellow Rating: 5