TY - CHAP M1 - Book, Section TI - Invasive Diagnosis of the Fetus A1 - Fleischer, Arthur C. A1 - Abramowicz, Jacques S. A1 - Gonçalves, Luis F. A1 - Manning, Frank A. A1 - Monteagudo, Ana A1 - Timor, Ilan E. A1 - Toy, Eugene C. PY - 2017 T2 - Fleischer's Sonography in Obstetrics and Gynecology: Textbook and Teaching Cases, 8e AB - Key TermsChorionic villus sampling (CVS): an invasive procedure performed for first-trimester prenatal diagnosis. CVS is typically performed between 70 and 91 days after the LMP. In the procedure, tissue is withdrawn from the villi (vascular fingers) of the chorion, a part of the placenta, and examined.Chorion frondosum: the cellular, outermost extraembryonic membrane composed of trophoblastic cells that develops villi and forms the fetal component of the placenta.Fluorescent in situ hybridization (FISH): rapid method of assessing targeted chromosomal abnormalities such as trisomy 21, 18, or 13.First-trimester screening: a method of screening for chromosomal abnormalities in the first trimester using two biochemical tests, PAPP-A and hCG, as well as sonographic nuchal translucency measurement. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/04/19 UR - obgyn.mhmedical.com/content.aspx?aid=1151027605 ER -