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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.
How to Fast. If you are required to fast prior to your blood test, you should receive specific instructions. Most cholesterol and triglyceride tests require fasting for 12 hours prior to the blood draw, while fasting blood glucose typically requires at least an 8 hour fast. Most people have fasting lab tests completed early in the morning, so if they need to fast for 12 hours, they can be sleeping for most of the fast.