Sugar in the blood is called blood sugar, mostly in number cases of both are glucose. Most of the energy required for the activity of cells in all tissues in the body comes from glucose, so the blood glucose must be maintained at a certain level to maintain the needs of all organs and tissues in the body. Normal people in the early morning fasting blood glucose concentration of 80~120 mg%. Fasting blood glucose concentration above 130 mg% is called hyperglycemia. Blood glucose concentration exceeds 160~180 mg%, a part of glucose is excreted with the urine, this is glucuria. Blood glucose concentration below 70 mg% is called hypoglycemia.