Diabetes is becoming more and more common in our daily lives and is getting more and more attention because we all know that once you have diabetes it is lifelong and serious complications can be life-threatening, so it is becoming more and more important to monitor your blood sugar frequently and at all times. The self-test method of diabetes is to measure the terminal blood glucose, that is, to measure the finger blood glucose with a blood glucose instrument, either during fasting time, or two hours after eating, or to measure the finger blood at any time. If fasting blood glucose is more than 7mmol/L, two hours after meal blood glucose is more than 11.1mmol/L, or random blood glucose is more than 11.1mmol/L, there are two or more times that diabetes is highly suspected, but the accuracy of this method is a little bit worse, and it is affected by the accuracy of blood glucose meter, daily monitoring is okay, but it is less accurate for diagnosis. In addition to self-testing, one should also go to a medical institution to collect venous blood to check venous blood glucose, which is more accurate, and the time of blood collection and the value for determining the presence of diabetes are the same as the first method. In addition, some countries can also check the glycosylated hemoglobin to determine the presence of diabetes, because the glycosylated hemoglobin response is about the average value of blood glucose in the past 2 to 3 months, if it is greater than 6.5%, it can be considered to have diabetes, but at present, China does not adopt. Therefore, the self-test for diabetes is mainly through the measurement of peripheral blood glucose, in addition to self-testing can also choose intravenous blood glucose and glycosylated hemoglobin to test.