Medical Genetics Fetal samples for cytogenetic analysis are commonly obtained in two ways: Amniocentesis -sample taken from the fluid of the amniotic sac. Chorionic Villus Sampling sample taken fetal tissue that forms part of the placenta. 8 This document is produced by trial version of Print2Flash.Visit www.print2flash.com for more informationThis document is produced by trial version of Print2Flash. Visit www.print2flash.com for more information