if the creatin level is too low it will also show as a fail, the whole test process is entirely chemically based - what a test will show is (including home tests) A. if creatin levels are too low it will register as a fail because the sample is too diluted. if it measures more than 50ppm of the metabolites it is a fail, so basically your best bet is increase your creatin level naturally or artificially, and dilute like mad the day you think you are going to be tested, from everything I have looked into, both past and present, diluting days or weeks before a test is a waste of time, the only time you need to dilute is within I'd say 3 hours before your test, but if you really don't know when you will be tested do it everyday until you are tested, another thing if you can stop smoking now! at least until you pass the test. look at some of my other posts and it will fill you in a bit more. Bottom line if you smoke within two days of your test you will more than likely fail even if it is just one hit. Also reduce activity level or keep eating heavily. the big thing is not to burn off fat cells (where the metabolites are stored within two days of the test. Pardon any misspellings I'm pretty wi[ped out at the moment - In any event, I hope it helps- any other questions please ask - I check this site off and on throughout the day - not that I'm saying I'm any expert, but I do know what is looked for and what seems to work - anyone else have any imput?