Chorionic VilliChorionChorionic Villi SamplingPrenatal DiagnosisAmniocentesisPregnancy Trimester, FirstPregnancyPlacentaTrophoblastsAmnionFetal DiseasesChromosome DisordersEgg ProteinsFetomaternal TransfusionGestational AgeKaryotypingExtraembryonic MembranesPregnancy, TubalPlacentationUltrasonography, PrenatalAbortion, SpontaneousDeciduaMethemalbuminTrisomyAmniotic FluidDown SyndromeCordocentesisBombyxPregnancy, High-RiskMaternal AgeMosaicismAneuploidyHydatidiform MoleNeckAbortion, EugenicChromosome AberrationsAbortion, SepticCrown-Rump LengthPregnancy Reduction, MultifetalPregnancy Trimester, SecondFetusNuchal Translucency MeasurementPregnancy, MultipleIntestine, SmallAllantoisPre-EclampsiaPregnancy Trimester, ThirdJejunumGenetic CounselingIntestinal Mucosabeta-ThalassemiaAbortion, InducedPregnancy OutcomeChoriocarcinomaLeukemia Inhibitory Factor Receptor alpha SubunitLabor, ObstetricMicrovilliVitelline MembraneImmunohistochemistryEgg ShellX ChromosomeHeterozygote DetectionChromosomes, Human, Pair 18IleumFetal DeathOryziasAbnormalities, MultipleBasement MembraneOogenesisRNA, MessengerFluorescent Antibody TechniqueDNAOvum