Blood glucose value of 12mmol/L or more, either fasting or 2 hours after meal, belongs to poor glycemic control. For undiagnosed patients, they should improve the examination and timely treatment; for diabetic patients, it is generally a poor glycemic control, and can be adjusted after communicating with the doctor to adjust the treatment program. Clinically, the normal range of fasting blood glucose is 3.9-6.1mmol/L, and the normal 2-hour postprandial blood glucose is less than 7.8mmol/L. Therefore, if you have more than 12mmol/L, whether it’s fasting or postprandial blood glucose, it is recommended that you go to the hospital in time to improve the glucose tolerance, glycated hemoglobin and other related tests, and then get timely treatment after diagnosis. For diabetic patients, the glucose control target is generally in the fasting blood glucose 4.4mmol / L ~ 7.0mmol / L, non-fasting blood glucose does not exceed 10.0mmol / L, but also need to set the glucose control target according to the individual situation, especially elderly diabetic patients can be appropriately adjusted to increase the glucose control target in order to prevent the occurrence of hypoglycemic reaction. Patients with blood glucose value of 12mmol/L or more should go to the hospital in time.