Glucose tolerance generally refers to the glucose tolerance test, blood glucose 5.7mmol / L both fasting blood glucose or 2 hours after meal blood glucose is within the normal range, no discomfort symptoms of people generally do not need to do glucose tolerance test. Glucose tolerance test is a glucose loading test, which can understand the body’s ability to regulate blood glucose and the body’s pancreatic islet B-cell function, and is an important test for the diagnosis of diabetes mellitus. The normal range of fasting blood glucose is 3.9~6.1mmol/L, and the normal range of 2-hour postprandial blood glucose should be less than 7.8mmol/L. Therefore, a blood glucose of 5.7mmol/L is within the normal range no matter it is a fasting blood glucose or a 2-hour postprandial blood glucose, and there is no abnormal glucose, so there is no need to perform a glucose tolerance test in general. However, if the patient has symptoms related to diabetes such as excessive drinking, excessive eating, excessive urination, etc., then it is necessary to consider performing a glucose tolerance test to clarify the diagnosis and timely treatment. If you are not sure whether you need to take a glucose tolerance test for a blood glucose of 5.7 mmol/L, it is recommended that you go to the hospital and ask a medical professional for a decision, so as to avoid delaying your condition.