D.B.
You need to call your doctor and talk to the nurse. If you try and guess or go with advice from the message board you run the risk of messing it up. Mine was this past week and I had to fast from 9pm the night before for my 9 am apt the next day. Not sure if there are different kinds of tests but this was the rule for mine. Just call and leave a message for the nurse. That is what you are paying them for.