High glucose tolerance means that the blood glucose level is higher than normal, but it may not have reached the standard of diagnosing diabetes mellitus, which needs to be further clarified by doing insulin-C peptide release test and glycated hemoglobin. 1. Insulin-C peptide release test: insulin-C peptide measurement and its release test is to determine the fasting and postprandial plasma insulin and C peptide levels, which can reflect the function of insulin B-cells, so as to determine the ability of the patient’s glucose regulation. 2. Glycated hemoglobin: It is closely related to the average blood glucose level in the past 2~3 months and can be used to evaluate the degree of control of diabetes treatment. People with high glucose tolerance need to be alerted to diabetes, and it is recommended that patients go to the hospital for further consultation and diagnosis and treatment as prescribed by the doctor.