Chorionic Villi SamplingPregnancy Trimester, FirstPrenatal DiagnosisPregnancy Trimester, SecondPregnancyUltrasonography, PrenatalFetal DiseasesPregnancy Trimester, ThirdPregnancy TrimestersAmniocentesisPrenatal Exposure Delayed EffectsGestational AgePrenatal CareAmniotic FluidPregnancy OutcomeAbortion, InducedAbortion, EugenicInfant, NewbornDown SyndromeAbortion, TherapeuticPregnancy ComplicationsFetusHeterozygote DetectionTrisomyFetal DeathGenetic CounselingAbnormalities, MultipleChromosome DisordersFetal HeartAbortion, SpontaneousFetal DevelopmentPre-EclampsiaPlacentaChorionic VilliHydrops FetalisAbortifacient AgentsCongenital AbnormalitiesPregnancy Complications, NeoplasticFetal Growth RetardationMaternal ExposureUltrasonography, Doppler, ColorGenetic TestingMaternal AgePregnancy Complications, InfectiousHeart Defects, CongenitalKaryotypingSensitivity and SpecificityProspective StudiesPregnancy, High-RiskEctromeliaFetoscopyRetrospective StudiesAbortifacient Agents, NonsteroidalMisoprostolChromosomes, Human, Pair 18Cordocentesisalpha-FetoproteinsCrown-Rump LengthThalassemiaAneuploidyBirth WeightMaternal-Fetal ExchangeTrophoblastsEstriolNuchal Translucency MeasurementChromosome AberrationsOligohydramniosAbortifacient Agents, SteroidalAbortion, LegalPregnancy Complications, CardiovascularFetal BloodPolyhydramniosSex Chromosome DisordersPlacental CirculationPregnant WomenObstetric Labor, PrematurePremature BirthHemoglobinopathiesNeural Tube DefectsUterine ArteryUltrasonography, Doppler, PulsedPedigreeDilatation and CurettageChromosomes, Human, Pair 13Postpartum PeriodPredictive Value of TestsRisk FactorsUltrasonographyTwins, ConjoinedSex Determination AnalysisHernia, UmbilicalCohort StudiesPreimplantation DiagnosisNeckUltrasonography, DopplerImaging, Three-DimensionalChorionic Gonadotropin, beta Subunit, HumanFalse Positive ReactionsSyndromePolymerase Chain Reaction