TrisomyDown SyndromeSyndromeKaryotypingChromosomes, Human, Pair 18Chromosome DisordersChromosomes, Human, 16-18Abnormalities, MultipleChromosomes, Human, Pair 21Chromosomes, Human, Pair 13Prenatal DiagnosisMosaicismNuchal Translucency MeasurementChorionic Gonadotropin, beta Subunit, HumanChromosome AberrationsChromosomes, Human, 13-15Nondisjunction, GeneticChromosomes, Human, 6-12 and XPregnancy Trimester, FirstUltrasonography, PrenatalMaternal AgeFetal DiseasesPregnancyPregnancy Trimester, SecondPregnancy-Associated Plasma Protein-AChromosomes, Human, 21-22 and YNasal BoneAneuploidyChromosome BandingDermatoglyphicsPregnancy, High-RiskAmniocentesisIn Situ Hybridization, FluorescenceCrown-Rump LengthTranslocation, GeneticChromosomes, Human, Pair 8MonosomyMetabolic Syndrome XTurner SyndromeChromosomes, Human, Pair 7Chromosomes, Human, Pair 12Chorionic Villi SamplingIntellectual DisabilityChromosomes, Human, 19-20Chromosomes, Human, 4-5NeckMyelodysplastic SyndromesGestational AgeInfant, NewbornChromosomes, Human, 1-3Nephrotic SyndromeSjogren's SyndromePedigreePhenotypeCytogenetic AnalysisCytogeneticsAbortion, EugenicSex Chromosome AberrationsFetusForeheadChromosomes, Human, Pair 5