A person's blood glucose level should be between 70 and 130 milligrams per deciliter before a meal, according to the American Diabetes Association. After eating, an acceptable reading is below 180 milligrams per deciliter.
A person's blood glucose level should be between 70 and130 milligrams per deciliter upon waking, states Novolg. This is called the fasting blood glucose. That baseline range is the target for individuals with diabetes who are not pregnant at the time of meter reading. A reading of less than 180 milligrams per deciliter is expected one to two hours after the beginning of a meal. Individuals tracking their blood glucose should record their levels for a period of time to share with their doctors.