What is Glucose, fasting blood?

Glucose, fasting blood: A method for learning how much glucose ( sugar)thereis in a blood sample taken after an overnight fast. The fasting bloodglucosetest is commonly used in the detection of diabetes mellitus. A blood sampleistaken in a lab, doctor's office, or hospital. The test is done in themorningbefore the person has eaten. The normal, nondiabetic range for bloodglucoseis from 70 to 110 mg/dl, depending on the type of blood being tested. Ifthelevel is over 140 mg/dl, it usually means the person has diabetes (exceptfornewborns and some pregnant women).