Amniocentesis can be used to check whether there are chromosomal abnormalities and genetic diseases in the fetus, as well as to check the amniotic fluid condition of the pregnant woman, etc. It also has a variety of therapeutic effects. 1. Means of examination: Amniocentesis is a method of clinical analysis and diagnosis of amniotic fluid extracted from the amniotic cavity by passing a puncture needle through the abdominal wall and uterine wall during the middle and late stages of pregnancy, which can be used as a means of examination during pregnancy. It can analyze the karyotype of the cells in the amniotic fluid and test the genes and gene products to determine whether the fetus has chromosomal abnormalities and hereditary diseases, and it can also check the amniotic fluid of the pregnant woman. 2. Therapeutic role: amniocentesis can be performed by injecting drugs or saline into the amniotic cavity, so that amniocentesis plays a therapeutic role, such as termination of pregnancy and promotion of fetal lung maturation. Amniocentesis is an invasive operation and may cause bleeding in pregnant women. In severe cases, hemorrhagic shock, amniotic fluid leakage, miscarriage, and injury to the baby’s limbs may occur. If the uterus is malformed or the placenta is located in the anterior wall, there is a risk of placental abruption and intrauterine infection after amniocentesis. Amniocentesis should be performed under the guidance of a specialized doctor, and bathing is prohibited for 24 hours after the test, and sexual intercourse is prohibited for a short period of time. If there is any abnormality after the examination, you should consult a doctor in time to avoid accidents.