Amniocentesis is a medical examination that consists of taking amniotic fluid in the pregnant woman to determine a possible abnormality of the fetus and in particular trisomy 21. The sample is completely painless and must be done as soon as possible.e or 14e week of amenorrhea.
The examination makes it possible to detect certain pathologies or hereditary diseases. A karyotype is established that will identify any anomalies in the number of chromosomes.
Aside from trisomy 21, amniocentesis is an examination that makes it possible to monitor at-risk pregnancies and to detect other fetal malformations: neurological diseases, toxoplasmosis ...
The amniocentesis is carried out in a hospital environment, the doctor takes with the aid of a very fine needle, passed through the abdomen, without anesthesia, 20 ml of amniotic fluid. No need to worry during the session, the ultrasound device will guide accurately the practitioner's actions.
The sample is then analyzed in the laboratory, the cells are cultured and analyzed under a microscope. In general, the final results are known after 10 days. In some cases, amniocentesis may be ineffective: when the placenta is located in front of the uterus, there is a risk that the fetal globules pass into the mother's bloodstream. And for Rh-negative women, the procedure should be followed immediately by an injection of gamma anti-D globulin within two hours after the puncture, to immunize the mother's blood.
Our advice: Every pregnant woman is concerned by this medical examination:àFrom the age of 38, it is reimbursed by the Social Security and it is advised to women at risk to practice (history of trisomy 21 in the family.).