A normal person’s 2-hour blood glucose of 8.6 mmol/L after the glucose tolerance test is slightly above the normal range, and it is recommended to consult a doctor for diagnosis and treatment. Glucose tolerance test is an important means of clinical diagnosis of diabetes mellitus. The normal 2-hour glucose after glucose tolerance test should be less than 7.8mmol/L. Therefore, a high 2-hour glucose after glucose tolerance test of 8.6mmol/L may be caused by diabetes, infection, stress, etc., and it should be combined with the results of other tests and clinical manifestations to make a comprehensive judgment. Diabetes can be diagnosed if the 2-hour blood glucose after glucose tolerance test is ≥11.1mmol/L and there are typical symptoms of “three more and one less” (excessive drinking, excessive urination, excessive eating and weight loss). Patients with a 2-hour glucose of 8.6 mmol/L after the glucose tolerance test are advised to consult a doctor for further examination and treatment as prescribed by the doctor.