A two-hour postprandial blood glucose level of 10 mmol/L or less may cause related complications. 1. Normally, two-hour postprandial blood glucose should be less than 7.8 mmol/L. A two-hour postprandial blood glucose level of more than 7.8 mmol/L and less than 11.1 mmol/L is considered to be prediabetic, and the specifics need to be evaluated in conjunction with fasting blood glucose. Prediabetes may develop into diabetes if diet and exercise are not intervened. 2. Comparatively speaking, if the diagnosis of diabetes mellitus is not intervened, the prolonged increase of blood glucose level may induce related complications. Relevant studies have shown that a series of complications may also occur in pre-diabetes, which can lead to atherosclerosis, and some patients have even developed coronary heart disease. Therefore, when the patient is in the pre-diabetic stage, he should also actively consult the endocrinology department of the regular hospital.