A Prenatal Test for Down Syndrome Without the Risk of Miscarriage
The method works by screening for extra copies of a fetal chromosome in the mother’s blood. In Down’s syndrome, the fetus has three copies of chromosome 21, called trisomy-21. In healthy fetuses, there are only two copies.
Amniocentesis, the standard method for Down syndrome testing, involves taking samples of genetic material from the fetus and comes with a risk of miscarriage. Other less invasive tests are not as accurate and can only estimate the risk of Down syndrome in the fetus.
The study was published in the journal Nature Medicine.