The best time points to measure blood glucose include fasting blood glucose, pre-meal blood glucose, 2-hour post-meal blood glucose, and bedtime blood glucose, and you can measure a 5-point blood glucose profile and a 7-point blood glucose profile. Patients with diabetes for diagnosis and treatment need to know their blood glucose changes throughout the day. Fasting blood glucose is one of the criteria for diagnosing diabetes. Patients can measure their blood glucose on an empty stomach early the next morning without eating any food and drinking a small amount of water after 10 p.m. Pre-meal blood glucose includes blood glucose before breakfast, lunch and dinner, which can provide patients with a reasonable diet control and treatment plan. The 2-hour postprandial blood glucose is also one of the criteria for diagnosing diabetes, which helps to administer medication more accurately. In addition, for some special patients, bedtime blood glucose and 1-3 a.m. blood glucose should be tested to avoid nighttime hypoglycemia and to formulate a more reasonable treatment plan for patients. For diabetic patients, they should choose reasonable treatment based on a full understanding of their blood sugar changes, and strictly control their diet and take their medication regularly.