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)?