The reference range of glucose tolerance value is not the same, because each hospital has different testing instruments and testing reagents, and the accuracy of the instruments is not exactly the same, so you can ask the doctor who conducts the test for details. Glucose tolerance test is a common test in which the test taker fasts for 8 to 10 hours the night before, and then adds 75 grams of glucose to 250 to 300 ml of water early the next morning and drinks it within 5 minutes to measure the fasting blood glucose, and blood glucose after 30 minutes, 1 hour, 2 hours and 3 hours. Fasting blood glucose is normal at 3.9 to 6.0 mmol/L, and blood glucose after 2 hours is normal less than 7.8 mmol/L. Different hospitals have different testing instruments and reagents, and the accuracy of the instruments is not exactly the same, so the reference range may be slightly different, so you can consult the doctor who conducts the test for details. If you have abnormal glucose tolerance, it is recommended that you seek medical treatment in time.