Whether fasting, postprandial or random, a blood glucose of 13.1 mmol/L is out of the norm and is abnormal. Normally, fasting blood glucose ranges from 3.9 to 6.1 mmol/L, two hours after a meal at less than 7.8 mmol/L, and random blood glucose is less than 11.1 mmol/L. Diabetes is usually diagnosed when fasting blood glucose of 13.1mmol/L is above the normal range and is accompanied by symptoms such as excessive thirst and drinking, excessive eating and hunger, weight loss and increased urination. It is usually necessary to do a comprehensive examination under the guidance of a doctor to bring down the blood sugar to normal level as soon as possible. If diagnosed with diabetes mellitus, you need to control your diet strictly, do not recommend eating sweet, fatty, fried and pickled foods, and reduce the intake of tobacco, alcohol, coffee and carbonated beverages. Actively participate in sports and take oral hypoglycemic drugs such as metformin hydrochloride tablets or subcutaneous insulin injection on time as prescribed by the doctor to control blood sugar. Patients with blood glucose of 13.1mmol/L should undergo the next step of examination under the guidance of a doctor, and at the same time follow the doctor’s instructions to actively control the blood glucose level.