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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.
I consider a fasting BG to be one where I haven't eaten for 8 hours or more. Usually, it's the first one in the morning when I wake up but if I have to have blood drawn and I don't get there (for whatever reason) until 3 hours after I rise, as long as I haven't eaten anything, it's still fasting.