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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.
Fasting Blood Tests. There are three main tests that require fasting -- glucose, cholesterol and iron. Cholesterol screenings require you to fast for at least 9 to 12 hours prior to blood work, with a 24-hour break from alcohol prior to testing.