I used to drink or eat nada after midnight. Then, after numerous sticks to try to find a vein I was asked if I had anything to drink. They told me never to do that as it was making it so much harder to get some blood. I was told that black coffee would be fine. Still takes more than one stick though!
You do need to ask your Doc though. Different tests might have different rules.
Diagnosed T2 October, 2009 A1c 6.8 Currently on Metformin ER 1000mg per day Last A1c 09/21/2013 5.4