The sugar in the blood is called blood sugar, and in most cases it is glucose. Most of the energy required for the activities of various tissues and cells in the body comes from glucose, so the blood sugar must be maintained at a certain level to maintain the needs of various organs and tissues in the body. The fasting blood glucose concentration of normal people in the morning is 80 ~ 1.20 mg%. Fasting blood glucose concentration exceeding 130 mg% is called hyperglycemia. If the blood glucose concentration exceeds 160 ~ 180 mg%, some glucose will be excreted with urine, which is called glycosuria. Blood sugar concentration below 70 mg% is called hypoglycemia.

The fasting blood glucose concentration of normal people is 3.9 ~ 6.0 mmol/L, and the fasting blood glucose concentration exceeding 6.0 mmol/L is called hyperglycemia. The blood sugar concentration below 3.9mmol/L is called hypoglycemia, and the blood biochemical examination report we get will generally say: glucose, or Glu.