I believe it is important to test your blood sugars when you are prediabetic. You have a small window of opportunity to prevent the progress of diabetes. Testing your blood sugars allows you to see what is going on with your blood sugars, how your body is metabolising carbs, how many carbs your body can handle and adjusting your diet so that your body can handle the carbs you do eat. In short, to adjust your diet to bring down elevated blood sugars preventing diabetes. Don't ignore prediabetes.