Women must undergo regular check ups after pregnancy in order to promptly detect any abnormalities in both the pregnant woman and the fetus. For example, Down syndrome screening and ultrasound are essential procedures that can detect whether a child has deformities and is at risk of developing Down syndrome. If the examination indicates a high risk of Down syndrome, amniocentesis is also necessary. So, how many weeks should non-invasive amniocentesis be done?
The best time for non-invasive amniocentesis is during the 17th to 21st week of pregnancy. Because at this time, the amount of amniotic fluid is relatively high and the fetus is not yet large, it is not easy to harm the fetus when extracting amniotic fluid through puncture. And after pumping 20-30 milliliters of amniotic fluid, it will not affect the development of the fetus. In addition, there are many live cells in the amniotic fluid during this period, and the success rate of cell culture is high.
After the Tang screening examination, if it is considered low-risk, there is no need for amniocentesis. If there is a high risk of Down syndrome screening, non-invasive amniocentesis is required to determine whether the fetus belongs to Down syndrome. After amniocentesis, the specific condition of the fetus can be determined.
In addition, non-invasive amniocentesis is also necessary when pregnant women are over 35 years old and there is a possibility of chromosomal abnormalities in couples. If you have given birth to a child with congenital defects in the past, non-invasive amniocentesis is also necessary.
