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Rating Newest Oldest. Best Answer: 8 to 10 hours is considered FASTING. You should be testing BEFORE each meal, and then again TWO HOUR after each meal. If you are under control, the FASTING reading (first thing in the morning, before breakfast) should be low-normal, like 80-100.
What is fasting? For the purpose of certain laboratory testing, fasting is when you have no food or drinks, with the exception of water and black coffee or tea for 10-12 hours prior to having your blood drawn. The most common tests that require fasting are blood cholesterol, triglyceride, glucose and insulin levels.