AmniocentesisAmniotic FluidChorionic Villi SamplingPrenatal DiagnosisPregnancy Trimester, SecondPregnancyFetal DiseasesDown SyndromeChromosome DisordersCordocentesisUltrasonography, PrenatalMaternal Agealpha-FetoproteinsRh IsoimmunizationPregnancy, High-RiskGestational AgeTest Anxiety ScaleEstriolChorioamnionitisGenetic CounselingAbortion, EugenicKaryotypingTrisomyCustodial CareLymphangioma, CysticCongenital AbnormalitiesChromosome AberrationsSex Chromosome AberrationsFetal DeathAbortion, SpontaneousBiological DressingsFetal Membranes, Premature RuptureAbortion, InducedPregnancy Trimester, FirstPregnancy, TwinObstetric Labor, PrematurePregnancy OutcomeIatrogenic DiseasePregnant WomenAneuploidyErythroblastosis, FetalAmnionNeural Tube DefectsAbortion, TherapeuticFetal Organ MaturityTwinsBlood Transfusion, IntrauterineFoot Deformities, CongenitalInfant, NewbornPregnancy, MultipleFreedomSex Determination AnalysisKaryotypeFetusMosaicismFetofetal TransfusionProspective Studies