Question About Levels

I am wondering about something. If a sample was sent to a lab and the THC levels were low enough to pass the instant test I hear is done first...BUT...the creatine (sp) level was lower, would that be what is consider a negative dilute?

I did a test last week using dilution method (which I have passed several times in the past) with asprin, rolaids, salty water and propel water additive BUT I ran out of creatine supplement and I didn't eat much red meat in the two days before hand. In fact, I wasn't able to eat too much due to be sick. I do know that the levels of thc were low enough for a negative due to a home test but I am concern about the other factors. Any thoughts out there?