the best diabetologist in yelahanka new town a fasting Glucosetest is a test of your blood sugar levels taken in the morniong before you have eaten a level of a126 mg/dl or higher may mean that you have diabetes. an oral glucose tolerence test entails drinking a beverage containing glucose and then having your blood glucose levels checked every 30 to 60 minutes for glucose level is 200 mg/dl . The a1ctest is a test is simple blood test that shows your, average blood sugar levels for the past 2-3 months .an a1c level of 6.5% or higher may mean you have diabetes.