its a home test dont worry about creatine just drink so much water that is diluted and a red line shows up i test myself all the time cause im on probation and i have a test tomorrow as a matter of fact thats a lab test though so i have to load up on creatine and shit but the home test are easy just drink like 2 gallons of water and piss 2-3 times before he gives you the test and make sure you give a mid stream sample cause the beginning and end of ur piss is the dirtiest