Diabetes ABCs

Diabetes ABCs: F

Fasting Blood Sugar
By Eileen B. Wyner NP
Bulfinch Medical Group


Fasting blood sugar is a test to determine how much glucose (sugar) is in a blood sample after an overnight fast. Typically, this test is done after 12 hours without any food or liquids except water. The fasting blood glucose test is commonly used to detect diabetes mellitus and may be done as part of a routine medical exam. A result less than 99 mg/dL is normal.