how long to fast before fasting glucose test
Standard rules dictate that in order to be fasting, you must not have had anything to eat or drink from 8-12 hours. At least 8 hours, but not more than 12, or you run the risk of dehydration or fainting.To help counteract that, make sure you drink plenty of water.or fasting sugar tests it  can have an affect. Fasting longer than 12 to 14 hours will cause  your body to start utilizing glycogen th â¦ at is primarily stored in  your muscles and that can affect blood tests for fasting sugar.