what is a highest a diabetics glucose level can be
And it's less than 140 mg/dL 2 hours after eating. During the day, levels tend to be at their lowest just before meals. For most people without diabetes, blood sugar levels before meals hover around 70 to 80 mg/dL.For some people, 60 is normal; for others, 90. The doctor tests your blood sugar level after fasting for 8 hours and itâs higher than 126 mg/dL. 2  Oral glucose tolerance test. 3  After fasting for 8 hours, you get a special sugary drink. 4  Two hours later your sugar level is higher than 200. 5  Random check.