ph tests to see if a sample is too acidic or too basic. A highly diluted sample will be outside of the acceptable range.

Killerweed, in your opinion, if I take no B-12 before my test, and my pee has some natural yellow in it, will this generally be an acceptable sample, meaning not too dilute. I have been doing some experimenting today with dilution, and I am trying to get this down to a science.

When people fail for being too dilute, can we assume their pee is completely clear (taking into account they haven't taken any B-12)?
killercam Reviewed by killercam on . Sample validity even for pre-employment test? Does anyone know, if I am getting a pre-employment UA, will they test the validity of my sample in regards to ph, creatine, etc? I know if someone is on probation generally speaking their sample is held under a microscope, but does anyone know if they will do an adulterant test for a pre-employment sample? Thanks! Rating: 5