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What is considered a high glucose level for a diabetic?

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Quick Answer

High blood sugar for adult diabetics is above 100 milligrams per deciliter after fasting for eight hours, above 130 milligrams per deciliter before a meal, and above 180 milligrams per deciliter after a meal, notes WebMD. Above 140 milligrams per deciliter is a high measurement at bedtime.

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Full Answer

What constitutes a normal blood sugar level varies slightly from person to person, explains WebMD. However, a consistent level that is higher than a person's normal range is potentially harmful. With enough time, consistently high blood sugar damages many organ systems. The target range for blood sugar in people with diabetes is between 70 and 130 milligrams per deciliter before meals and less than 180 milligrams per deciliter after meals.

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