A normal morning fasting blood sugar level ranges between 70 and 100 milligrams per deciliter, states MedlinePlus. Some laboratory cutoffs differ by a few milligrams.
Morning blood sugar level is typically also known as fasting blood glucose level and is taken before the first meal of the day. This measurement lends insight to the body's ability to regulate blood glucose levels in absence of any prior dietary intake, explains MedlinePlus.
There is a disease in which the body is unable to correctly metabolize blood glucose due to insulin resistance, known as Type 2 diabetes mellitus. In these individuals, a fasting blood glucose level between 100 to 125 milligrams per deciliter is considered prediabetes, and a level above 125 milligrams per deciliter is diagnostic of diabetes mellitus.