Fasting Blood Glucose

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Fasting Blood Glucose Level

Fasting blood glucose is a measure of the quantity of glucose present in an individual’s blood stream after abstaining from eating for at least eight hours.1 This test is used to screen for diabetes. Levels less than 100 mg/dL are considered normal. Levels between 100 and 125 mg/dL indicate impaired glucose tolerance (aka pre-diabetes). Levels above 125 mg/dL indicate diabetes.

The chart below provides fasting blood sugar numbers and descriptions as provided by the American Diabetes Association.


Fasting Blood Glucose Level Chart

Fasting Blood Sugar Level (mg/dL)


70-99 Normal
100-125 Prediabetes
>126 Diabetes

Fasting blood glucose levels between 70 and 100 mg/dL are considered normal. A level between 100 and 125 mg/dL means you have impaired fasting glucose, a type of pre-diabetes. This increases your risk of developing type 2 diabetes. A level greater than 126 mg/dL usually means you have diabetes.

For a comprehensive overview of Diabetes, see our Diabetes section under medical health issues.

External Resources: MedLinePlus: Blood Sugar Test

Updated: May 12, 2015


1. Lin J. Glucose. Medscape Reference; 2012.