The American Diabetes Association provides an online resource that shows the blood-sugar levels that may indicate prediabetes. A fasting blood-glucose level of 100 to 125 milligrams per deciliter indicates prediabetes, according to the American Diabetes Association.
A score of 5.7 percent to 6.4 percent on the A1C blood test also indicates the patient has prediabetes, explains the American Diabetic Association. Additionally, a blood-glucose level of 140 to 199 milligrams per deciliter on the OGTT two-hour test also indicates prediabetes. In prediabetes, glucose levels are higher than they should be, but they are not high enough to be considered diabetes. Prediabetes is a risk factor for type 2 diabetes and cardiovascular disease.
People with prediabetes do not necessarily develop diabetes, states the American Diabetes Association. If caught and treated in early stages, treatment can prevent prediabetes from developing into diabetes. Losing weight and starting an exercise program can reduce the chances of developing diabetes. Researchers have discovered that losing even 7 percent of total body weight can lower a prediabetic's risk. A moderate exercise program, such as walking briskly for 30 minutes per day five times a week, can also lower the risk. With early treatment, some prediabetics may find that their blood sugar can return to normal levels.