just keep it in the refrigerator..for up to two weeks in a sterile bottle get a 3-4 ounce bottle and put in your whitey tghties...boxers don't work well . tape a heat warmer pad to it and go give your sample..bring it with you when you interview....but most likely you will take your test within 3-7 days of the final interview...good luck..i think qf still works to