Pre-meal glucose testing: When the blood glucose level is very high, the fasting glucose level is the first concern. Those who are at risk of hypoglycemia (the elderly, those with better glycemic control) should also have their pre-meal glucose measured. Postprandial 2 hours blood glucose monitoring: It is applicable to those whose fasting blood glucose has been well controlled but still cannot reach the treatment target. Bedtime glucose monitoring: Applicable to patients who inject insulin, especially those who inject medium and long-acting insulin. Nocturnal blood glucose monitoring: Applicable to patients whose insulin therapy is close to the therapeutic target but whose fasting blood glucose is still high. Blood glucose should be monitored promptly when symptoms of hypoglycemia appear. It is advisable to monitor blood glucose before and after strenuous exercise.