If a woman wants to know if she has gestational diabetes after pregnancy, then she can go to the hospital for a glucose tolerance test to confirm the diagnosis. At this stage, a glucose tolerance test is usually done with 75 grams of glucose powder. Because the glucose tolerance is done in several hours, it has 3 normal values: fasting blood glucose 5.1 mmol per liter, one hour after taking sugar blood glucose 10.0 mmol per liter, and two hours after taking sugar blood glucose 8.5 mmol per liter. Gestational diabetes is diagnosed if the blood glucose is equal to or higher than normal at more than 1 of these 3 time points. A glucose tolerance test is not required if there is a previous history of diabetes, but blood glucose and glycated hemoglobin should be monitored. If gestational diabetes is diagnosed, you need to control your diet and exercise at the same time. If diet + exercise cannot control your blood sugar, you need to treat with insulin. If gestational diabetes is not well controlled, there are some hazards to the mother and the fetus, such as easy to have a huge baby, easy to miscarry, etc. Therefore, it is necessary to control blood sugar well. If a pregnant woman wants to do a glucose tolerance test, she needs to fast in the evening of the first day, and the hospital does the glucose tolerance test in the morning, so if it exceeds this time period, it may affect the results of the test, and there is no need to be afraid of multiple blood draws, in fact, the amount of blood drawn each time is very small, and there is no harm to the pregnant woman herself.