I guess so. Just do a "google" of pre-diabetes. This will discuss the numbers. The normal level is below 100. Typically blood work-up will show those numbers.
Not to be argumentative, but what I have been taught, normal fasting blood sugar levels run between 70-110 mg/dl according to the "new" standard. (The old standard, and still used by many physicians, was 70-125 mg/dl. A cynical view of the 15 mg/dl difference would note the financial boon the measly 15 mg generates.) A value above 140 mg/dl (again a lowered new figure and subject to the same cynical evaluation) on at least two occasions would be a rather strong indicator the the tested individual has diabetes.
A glucose tolerance test uses a glucose solution administered to raise a fasting patient's blood/glucose level to 200mg/dl. Then a series of blood samples are drawn over the following 3 hours. The long and the short of it is that in three hours the normal patient's blood sugar level will return to the normal fasting level of between 70-110 mg/dl (or 125 mg/dl depending on how cynical you are).
If someone has better info I'd very much like to hear about it.