The advent of noninvasive prenatal testing allow for the use of a simple blood draw from a pregnant woman to tests fetal DNA for genetic conditions. As with liquid biopsies, these test rely on capturing cell-free DNA from the fetus circulating in the mother’s blood. We spoke to Paul Billings, chief medical officer for Natera, about the state of non-invasive prenatal testing, the growing use of these tests, and the range of conditions they can detect.