The normal blood glucose level for women or men is less than 100 milligrams per deciliter after fasting for eight hours or 140 milligrams per deciliter two hours after a meal, according to WebMD. Most people without diabetes have glucose levels of 70 to 80 milligrams per deciliter before meals.
Doctors usually diagnose patients with diabetes if they have a fasting glucose level of 126 milligrams per deciliter or higher, according to WebMD. A random blood sugar test that is higher than 200 milligrams per deciliter may also indicate diabetes. An oral glucose tolerance test involves the patient drinking a sugary drink after eight hours of fasting. If a patient's blood sugar measures over 200 milligrams per deciliter two hours after consuming the drink, diabetes is typically diagnosed.
