The normal range of fasting blood sugar values (measuring only glucose and not saccharoids) is eighty to one hundred mg/dl. Most fasting blood sugars are within the normal range, so a simple fasting test is useless.
The figure below depicts the shape of a normal Glucose Tolerance Test curve. You can plot your own test numbers on it.
Normal Glucose Tolerance Test curve
Other types of curves:
The solid red line is clearly in the diabetic range. To determine your risk level, add the first four figures:
If the total is under five hundred, you are not diabetic. If they total over eight hundred, you are definitely diabetic. The group between five hundred and eight hundred typically have problems with a delay in their production of insulin and being overweight. Their glucose curves may best respond to a nutritional (diet) adjustment and weight loss.
The dark-blue stripped line is Pre-Diabetic. A sharp climb in blood sugar levels into the diabetic range the first hour followed by a release of a substantial amount of insulin that dramatically drives the elevated reading down into a hypoglycemic state before adrenalin stops the fall and saves the day.
The yellow spotted line is Reactive Hypoglycemia (up and down rapidly). A rapid rise in blood sugar within the first half an hour of the test followed by a flood of insulin that usually bottoms out the third hour and is often accompanied by anxiety, sweating, heart pounding at this point.
The purple broken line is the low flat curve; it shows very little rise of blood sugar, in response to glucose loading. Instead the levels seem to drift along in a flat pattern. This curve is characteristic of young people. It indicates exhaustion, poor absorption (of glucose) from the GI tract, possible thyroid, adrenal or pituitary/adrenal insufficiency, or automatic nervous system disturbances.
All of these patterns call for a major overhaul in your diet to normalize your glucose metabolism and banish your hypoglycemia symptoms.