Fasting blood sugar (glucose): Normal levels and testing. Medically reviewed by Jenneh Rishe, RN — Written by Emily Cronkleton — Updated on January 23, 2024. Fasting blood sugar levels; ...

Now, in a normal individual we measure blood sugar under different circumstances. What we call fasting blood sugar or blood glucose levels is usually done six to eight hours after the last meal.

A normal fasting blood sugar level is 99 milligrams per deciliter (mg/dL) or below. Fasting means that you haven’t eaten for 8-10 hours before the test.

Our data show that if FBS alone had been used, 81% of subjects with isolated abnormalities in 2hBS (isolated IGT) would have been diagnosed as having normal glucose tolerance, while 17% of ...