it depends on what kind of test you are takin. If its an instant test that they dip something in yer pee and u find out right away u might want to consider going to a pipe shop and buying a drink to cover up the thc. worked for me. but only if its instant results i took a drink one time and they didnt mail my pee to the clinic for a week and the drink wore off in the pee. But if you are not sure what your gonna do just quit until the test and try to fill yer bladder with water that day before the test. Good Luck.