The normal range of morning fasting blood glucose is between 3. 9 and 6.1 mmol/L. Blood glucose is glucose in human blood, fasting blood glucose is the concentration of blood glucose during the night fasting, the next morning before meals, the range of fasting blood glucose is an important indicator for the diagnosis of disorders of glucose metabolism. If fasting blood glucose is elevated, it may be due to diabetes, or it may be caused by endocrine disorders such as hyperthyroidism, glucagonoma, gigantism, or pheochromocytoma. If you eat a meal before measurement, or strenuous exercise, emotional abnormalities, etc. may also lead to elevated fasting blood glucose, which is usually physiological and does not require special treatment. Fasting blood glucose can be lowered if there is hypoglycemia, excessive use of insulin, or severe malnutrition. If fasting blood glucose increases or decreases for a long period of time, it is recommended that the patient undergoes timely treatment to avoid causing damage to other organs.