There are many items of obstetric examination, and different pregnant women need to choose targeted examination contents according to their actual situation: 1. All pregnant women need routine examination items during pregnancy mainly include ultrasound examination in early pregnancy, one system examination before 12 weeks of pregnancy, including liver and kidney function tests, hepatitis B three systems, blood sugar, blood lipids, blood type and other laboratory tests, electrocardiogram, Down’s syndrome screening, 2. It is better to have an early NT test; 3. If there are abnormalities in the early NT test or mid-term Down’s screening, a non-invasive DNA test is needed; 4. If abnormal fetal development is found, or if there are abnormalities such as placenta praevia or amniotic fluid, the number of ultrasound tests needs to be increased; 5. If there are abnormalities and the possible presence of thyroid If there are abnormalities, it is necessary to do thyroid function tests.