Glucose tolerance is a test that screens pregnant women for gestational diabetes. Not having the test itself will not affect the baby, but if gestational diabetes is undetected and untreated during pregnancy, it may affect the baby. The glucose tolerance test, also known as the glucose tolerance test, is a test that is done at 24 to 28 weeks of pregnancy to screen for gestational diabetes. If it is not done, the pregnant woman will not know if she has gestational diabetes. If there is gestational diabetes mellitus without appropriate treatment to control blood sugar, then it may affect the growth and development of the fetus, resulting in fetal gigantism or fetal growth restriction, fetal malformation, preterm delivery and so on. After pregnancy, women should do regular checkups, do not miss any checkups, there are abnormalities can be detected at an early stage and do the appropriate treatment to ensure the safety of mothers and babies.