Keep in mind that creatinine is tested as well as specific gravity in determining an overdiluted sample. Therefore when utilizing any dilution techniques, you want to load up on creatine 2-3 days before the scheduled U/A in order to keep the creatinine levels at a satisfactory reading. Creatine-loading will not do any good on the day of the U/A because it takes 2 days for the body to convert creatine into creatinine. Read up on the Dilution sticky thread.