An embryo needs to be nurtured in the mother's body for a long period of time. During this period, expectant mothers need to be cautious and do not know what problems the embryo may encounter during development. Therefore, expectant mothers need to go to the hospital for prenatal checkups in a timely manner, one of which is non-invasive DNA testing. Next, let's learn about non-invasive DNA testing for all chromosomes?
Non invasive DNA testing is the process of extracting free DNA fragments from the fetus, using genetic sequencing technology to analyze DNA sequencing and biological information, in order to determine the genetic status of the fetus and detect the high or low risk of chromosomal diseases in the fetus.
In general, non-invasive DNA testing does not screen all chromosomes, but focuses on chromosomes 13, 18, and 21, as these chromosomal abnormalities can cause the fetus to develop Patao syndrome, Edwards syndrome, and Down syndrome, while abnormalities in other chromosomes can directly lead to fetal death in the mother's body. Therefore, it is not necessary to check for other chromosomes.
If a pregnant woman passes the Down syndrome screening and the result is positive, non-invasive DNA screening is required to prevent errors in the Down syndrome screening results. Non invasive DNA testing needs to be performed by pregnant women around 16 weeks of pregnancy. If the results are still abnormal, according to medical advice, amniocentesis, a invasive procedure, is required for further diagnosis.
