Glucose tolerance test usually does not need to carry extra things, fasting 8~10 hours to go to the hospital to check. Glucose tolerance test refers to giving adults oral administration of aqueous solution containing 75g anhydrous glucose, taking fasting blood (0min) before taking glucose, and then taking blood at 30min, 60min, 120min and 180min minutes after taking glucose to measure the changes in blood glucose. Oral glucose tolerance test is a glucose load test to understand the function of pancreatic β-cells and the body’s ability to regulate blood glucose, and it is a confirmatory test for the diagnosis of diabetes mellitus, widely used in clinical practice. It should be noted that patients should stop taking diuretics and contraceptives 3-7 days before the test, and the diet should contain at least 150 grams of carbohydrates per day for three days before the test. Fasting is required for 8~10 hours before the test, and fasting is also required on the morning of the test. Smoking, alcohol, coffee and tea are prohibited during the test, and strenuous exercise is not allowed. For more information on the precautions to be taken during the glucose tolerance test, it is recommended that you consult a specialist.