I was rushed to the hospital with a BG of 22, but was still conscious. So I would guess pretty low; but I'm sure it varies with the general health of the person. The average fasting for a "normal person" in the morning is between 60-100.
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Prolonged blood sugar extremes - blood sugar that's either too high or too low for too long - may cause various conditions, all of which can lead to a diabetic coma.Symptoms are influenced by the severity of the hypoglycemia. With longstanding Diabetes, however, you may lose the early warning signs - such as hunger and perspiration - and may only develop symptoms when your blood sugar is dangerously low. This is called hypoglycemia unawareness.levels can not be generalized...have to consult a doctor most essentially for that.