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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.
If dinner is the last thing you eat for the day, you'll have fasted for 10-12 hours by an early morning lab draw. However, if you're a late-night snacker, you'll have fasted maybe 6-7 hours. Usually, 6 hours is the minimum amount of time in which to perform any fasting test (at a hospital, anyway).f the patient's cholesterol is to be fractionated, he or she also should avoid alcohol for 24 hours before the test. http://www.healthatoz.com/healthatoz/Ato... To get accurate results, you should fast for 9 to 12 hours before the test.