Is 57 low for blood sugar or glucose?

A blood sugar level of 57 milligrams per deciliter is a low number. Any reading below 70 milligrams per deciliter is called hypoglycemia and requires treatment to correct blood sugar levels. Normal fasting values are slightly less than or equal to 100 milligrams per deciliter, according to WebMD.

A value of 140 milligrams per deciliter or less is normal for a person younger than 50 years when levels are checked two hours after a meal. The normal value for an individual over age 60 is 160 milligrams per deciliter or less when checked two hours after a meal. Random normal values range from 80 milligrams per deciliter before meals to 140 milligrams per deciliter before bedtime, according to WebMD.