According to the American Diabetes Association, there are no clear symptoms that indicate prediabetes. Doctors must run blood glucose tests to determine if prediabetes is present.
Prediabetes is a condition in which blood glucose levels are higher than normal, but not high enough to be considered diabetes, states MedlinePlus. Levels indicative of prediabetes are an A1C (average blood sugar test) of 5.7 to 6.4 percent, a fasting blood glucose of 100 to 125 milligrams per deciliter, and an oral glucose tolerance test showing a two-hour blood glucose ranging from 140 to 199 milligrams per deciliter, says the American Diabetes Association.
Prediabetes can lead to type 2 diabetes and cardiovascular disease. However, it can also be reversed, claims the American Diabetes Association. Losing body weight and incorporating regular exercise both lower the risk for prediabetes. MedlinePlus recommends that people lose between 5 and 10 percent of their total body weight and be physically active for at least 30 minutes per day to either prevent or reverse prediabetes. WebMD also suggests changing any unhealthy nutrition practices and incorporating low-fat proteins, whole grains and vegetables into the diet.
Although prediabetes does not often show symptoms, high blood sugar does, according to the American Diabetes Association. Symptoms of high blood sugar are the frequent need to urinate, increased thirst, high sugar levels in the urine and high blood glucose.