Measuring one hour postprandial blood glucose after eating steamed buns, 10 minutes in advance of the test is likely to have an impact, which will result in numerical measurement bias, affecting the judgment of the actual postprandial blood glucose. Clinical diagnosis of diabetes mellitus or assessment of the condition is generally based on fasting blood glucose and 2 hours postprandial blood glucose. Clinical measurement of postprandial blood glucose is mainly to assess the secretion function of pancreatic islet cells and insulin resistance, and needs to be measured in strict accordance with the prescribed time in order to accurately determine the metabolic status of blood glucose through the standard value range. Measurement of blood glucose 10 minutes in advance may be different from normal and may not accurately reflect the blood glucose value. Clinical determination of fasting and postprandial blood glucose requires blood sampling in strict accordance with the prescribed time, which can be performed under the guidance of a doctor.