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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.
Patients should fast for at least 12 hours before they have a fasting blood test, according to St. John Providence Health System. Not all blood tests require patients to fast, but those that do... Patients should fast for at least 12 hours before they have a fasting blood test, according to St. John Providence Health System.