How is amniocentesis performed?
I've been pregnant for some time now, and my doctor told me to have an amniocentesis. I don't know much about it and feel a bit scared. I'd like to know exactly how this amniocentesis procedure is performed.
Doctor's answer (1)
Amniocentesis is a prenatal diagnostic technique primarily used to detect fetal genetic disorders and chromosomal abnormalities. Proper preparation is required before the procedure. Sexual intercourse should be avoided for 3 days prior to the procedure, and the patient should bathe the day before. An ultrasound examination will be performed beforehand to determine the position of the placenta, as well as the condition of the fetus and amniotic fluid, to assess whether amniocentesis is appropriate.
During the procedure, the doctor will use an ultrasound device to locate the position of the fetus and the amniotic sac within the uterus, selecting a safe puncture site away from the placenta, fetus, and umbilical cord. After administering local anesthesia, a thin, long needle is inserted through the abdominal skin directly into the amniotic sac to withdraw about 20 milliliters of amniotic fluid. The sample will be sent to a laboratory for cell culture, followed by analysis of the fetal genetic information using techniques such as chromosome analysis and gene sequencing.
Amniocentesis is generally recommended between 16 and 20 weeks of pregnancy, when the volume of amniotic fluid is adequate and the risks are relatively low. Before deciding to undergo amniocentesis, the doctor will thoroughly discuss its benefits and risks with the pregnant woman, and she will be required to sign an informed consent form.
