title: Performance of non-invasive prenatal testing when fetal cell-free DNA is absent.
authors.affiliation: Boston Maternal-Fetal Medicine, Boston, MA, USA.
authors.forename: T
authors.initials: T
authors.lastname: Takoudes
authors.forename: B
authors.initials: B
authors.lastname: Hamar
mesh_terms: D004247:DNA / Q000097:blood; D005260:Female; D005333:Fetus / Q000166:cytology; D006801:Humans; D062145:Maternal Serum Screening Tests / Q000592:standards; D008431:Maternal-Fetal Exchange; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000592:standards*; D017422:Sequence Analysis, DNA
chemical_list: D004247:DNA