Glucose tolerance test is a glucose tolerance test, which is mainly used clinically to diagnose suspected diabetes mellitus whose symptoms are not very obvious, or whose blood glucose elevation is not obvious. Glucose tolerance test is a test to detect the function of glucose metabolism, and there are two testing methods, namely oral glucose tolerance test and intravenous glucose tolerance test. At present, the oral glucose tolerance test is generally used, which detects fasting blood glucose as well as blood glucose and urine glucose 30 minutes, 1 hour, 2 hours and 3 hours after oral glucose intake, respectively. The specific reference values are: fasting blood glucose 3.9-6.1mmol/L, blood glucose <11.1mmol/L at 1 hour, blood glucose <7.8mmol/L at 2 hours, and blood glucose back to the fasting blood glucose level at 3 hours after oral glucose intake, and the urine glucose at each checking time point is negative. The clinical significance of glucose tolerance test is mainly used to understand the body's ability to regulate glucose, and clinically it is mainly used to diagnose diabetes and determine whether glucose tolerance is normal. If you find an abnormal glucose tolerance test, you should go to the hospital in time to get a clear diagnosis and standardize the treatment under the doctor's guidance.