What is considered a normal blood sugar level?

Normal blood sugar levels are lower than 100 milliliters per deciliter of blood after fasting and 140 milliliters per deciliter of blood two hours after eating, according to WebMD. Hypoglycemia and hyperglycemia are the technical terms for low and high blood sugar levels, according to the American Heart Association.

The American Heart Association states that blood sugar levels below 70 milliliters per deciliter of blood are classified as hypoglycemia. High blood sugar levels are anything over 240 milliliters per deciliter of blood, according to WebMD. While hypoglycemia can come on quickly within a few hours, hyperglycemia usually comes on slowly over a period of time.