Diabetes, technically called Diabetes Mellitus, is a chronic metabolic disorder (last throughout the life) that results in increased blood glucose levels caused by defects in insulin secretion, insulin insufficiency, or both. A blood glucose level < 140 mg/dl is normal. A reading of > 200 mg/dl after 2 hours of your meal indicates that you likely have diabetes. A reading of 140-199 mg/dl is considered a prediabetic stage.