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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.
Length of Fast. According to the Health Services at Columbia, fat and cholesterol components are usually only measurable for approximately 10 hours after a meal. Because of this, most physicians recommend fasting for a period of at least 12 hours before a fasting cholesterol test.