Notes for booking fetal chorionic villus, amniotic fluid and umbilical cord blood puncture 1. The operation time of fetal chorionic villus, amniotic fluid and umbilical cord blood puncture in our center is every Tuesday afternoon and every Friday afternoon. 2. The time of fetal chorionic villus puncture is 10-14 weeks of pregnancy. 3. The time of fetal amniotic fluid puncture sampling is after 18 weeks of pregnancy. 4. The time of fetal umbilical cord blood puncture is after 24 weeks of pregnancy. 5. Please bring the original/copy of the following test results during the operation. Liu Ning, Genetic and Prenatal Diagnostic Center of Zhengzhou University First Affiliated Hospital Pregnancy blood routine (results valid within one week) Maternal infectious disease screening (results valid within three months, including hepatitis B, hepatitis C, AIDS and syphilis) RH blood type (required for first pregnancy) 6. No abdominal pain, bleeding and other symptoms of preterm abortion within two weeks before surgery, no infection and other uncomfortable symptoms, if you have the above symptoms, please postpone the surgery. 7. Address of prenatal diagnosis center: prenatal diagnosis center on the 2nd floor of the outpatient clinic of the First Affiliated Hospital of Zhengzhou University Consultation telephone: 0371-66913236 (Dr. Wu, Dr. Liu)