Preconception basic screening, liver and kidney function, blood and urine routine, teratogenic eight items, gynecological routine examination, etc. are required. The liver function is mainly to detect all types of hepatitis and to diagnose liver damage. If the mother is a viral hepatitis patient and it is not detected in time, pregnancy can have very serious consequences, such as premature birth and even death of the newborn. The hepatitis virus can also be transmitted vertically to the child. Blood tests are performed for early detection of blood body disorders such as anemia. If the mother is anemic, she is not only prone to complications such as postpartum hemorrhage and puerperal infections, but also susceptible to infections, decreased resistance and stunted growth. Urine routine, on the other hand, helps in the early diagnosis of kidney disorders. The eight teratogenic items include rubella, toxoplasmosis and cytomegalovirus. Rubella virus has a high chance of infection, and once infected, especially in the first trimester, it can cause miscarriage and fetal malformation. Routine gynecological examination is to screen for trichomonas, mycobacteria, mycoplasma chlamydia, vaginal inflammation and sexually transmitted diseases such as gonorrhea and syphilis through routine white belt examination, which is used to determine whether there are gynecological diseases; if you are diagnosed with sexually transmitted diseases, it is better to treat them thoroughly before pregnancy, otherwise there is also a risk of miscarriage and premature birth.