A glucose screening test for pregnant women is usually performed between 24-28 weeks after pregnancy and is a screening test for gestational diabetes, which most women need to have. Glucose screening is the measurement of serum glucose, which includes fasting glucose, random glucose and glucose tolerance test. Under normal circumstances, the value of fasting glucose of pregnant women should not be higher than 5.1 mmol per liter, one hour after taking sugar should not be higher than 10.0 mmol per liter, and two hours after taking sugar should not be higher than 8.5 mmol per liter. If this value is exceeded, it means that the pregnant woman has some problems with her glucose metabolism and needs to be intervened and, if necessary, treated. How is a glucose tolerance test performed? There are certain requirements, which require the pregnant woman to fast for 12 hours, have her blood drawn on an empty stomach, then drink 200 ml of 75% sugar water and have her blood glucose tested one hour, two hours and blood drawn after taking it, respectively. If the blood glucose exceeds any of the above criteria, the pregnant woman is diagnosed with gestational diabetes. It is very important to check blood glucose in women who have diabetes or are obese. It is also important to eat a light diet with less sugar and fatty foods.