Some mothers have the misconception that after pregnancy, women will eat a lot of nourishing foods for the growth and development of the fetus, but in fact, these nourishing foods can easily lead to the emergence of gestational diabetes mellitus. There are many screening methods for gestational diabetes, including glucose tolerance test, fasting blood glucose screening, random blood glucose screening, and glycosylated hemoglobin test. In early pregnancy (within 3 months), fasting blood glucose ≥7.0mmol/L (126mg/dl); glycosylated hemoglobin ≥6.5%; 75g glucose tolerance test 2 hours ≥11.1mmol/L (200mg/dl) or random blood glucose ≥11.1mmol/L, accompanied by the typical symptoms of the three more than one (eat more, drink more, urinate more, and gain less weight) can be diagnosed as It is diabetes mellitus combined with pregnancy. Gestational diabetes mellitus is a 75g glucose test performed at 24-28 weeks of gestation, with normal activity for 3 days prior to the test and eating no less than 3 two main meals per day. After fasting for at least 8 hours, fasting blood is drawn early in the morning before 9:00 a.m., then 300 ml of water containing 75 g of glucose is drunk within 5 minutes, and blood is drawn twice more, 1 hour and 2 hours from the start of drinking the sugar water. During this period, sit still and abstain from smoking. Gestational diabetes can be diagnosed if the fasting blood glucose, one hour and two hours after taking glucose are greater than or equal to 5.1mmol/L, 10.0mmol/L and 8.5mmol/L respectively. Or only fasting blood glucose greater than or equal to 5.1mmol/L can also diagnose gestational diabetes, you can no longer take sugar water. If the test is normal and fails to diagnose gestational diabetes, but the person is at high risk, i.e., over 35 years of age, obese and overweight, polycystic ovary syndrome, family history of diabetes, having given birth to a giant child, or having a large amniotic fluid in the later stages of the current pregnancy, large fetus, or recurrent Pseudomona vaginalis infections, etc., the 75 g glucose test needs to be repeated around 32 weeks of gestation in order to further rule out the risk of gestational diabetes.