The cost of the glucose tolerance test, which costs about$50-60, is a blood test taken at 24-28 weeks of pregnancy. On the day before the glucose tolerance test, you should fast for 8-14 hours after dinner and have your blood drawn on an empty stomach once before 9:00 the next day. Then drink powdered sugar. Dissolve 75mg of powdered sugar in 300ml of water and finish it within 5 minutes. One hour and two hours after drinking powdered sugar, venous blood was drawn for blood glucose testing. Generally, the glucose oxidase method was used to determine the value of blood glucose. The normal values are 5.1 mmol/L for fasting blood glucose, 10.0 mmol/L for one hour after taking sugar, and 8.5 mmol/L for two hours after taking sugar. one of these values reaches or exceeds the normal value, the diagnosis of gestational diabetes is made.