Pregnant women are not exempted from glucose tolerance. Glucose tolerance, also known as glucose tolerance test, is a very necessary pregnancy test during pregnancy, because during pregnancy the placenta secretes insulin-resistant substances that affect the sugar metabolism of pregnant women, which makes them prone to gestational diabetes. Gestational diabetes has too high a risk of affecting both the pregnant woman and the fetus, such as being prone to maternal infections or poor fetal development, so it is important to be checked as early as possible, so that if, in the unlikely event that elevated blood glucose is detected, it can be controlled as early as possible to minimize this risk. The time to perform the glucose tolerance test is usually between 24 and 28 weeks of pregnancy. It is safer to have the test done in the hospital in time after reaching the gestational week, so that if there is any abnormality it can be detected as early as possible and treated as early as possible to reduce the risk of subsequent pregnancies.