Down SyndromeSyndromeChromosomes, Human, Pair 21Metabolic Syndrome XPrenatal DiagnosisTrisomyNephrotic SyndromeSjogren's SyndromeMaternal AgeTurner SyndromePregnancy Trimester, SecondEstriolAbnormalities, MultiplePregnancyMyelodysplastic SyndromesWilliams SyndromeCushing SyndromeIntellectual DisabilityAmniocentesisAcute Coronary SyndromePolycystic Ovary SyndromeLeukemia, Megakaryoblastic, AcuteFetal DiseasesInfant, NewbornChromosomes, Human, 21-22 and YDiGeorge SyndromeHorner SyndromePrader-Willi SyndromeLong QT SyndromeKaryotypingAbortion, EugenicGuillain-Barre SyndromeHemolytic-Uremic SyndromeCompartment SyndromesTourette SyndromeAntiphospholipid SyndromePhenotypePorcine Reproductive and Respiratory SyndromeKlinefelter Syndromealpha-FetoproteinsCarpal Tunnel SyndromeWerner SyndromeReye SyndromeBartter SyndromeUltrasonography, PrenatalNasal BoneMutationPorcine respiratory and reproductive syndrome virusPedigreeHELLP SyndromeNuchal Translucency MeasurementDisease Models, AnimalNondisjunction, GeneticBloom SyndromeBrugada SyndromeCraniofacial AbnormalitiesPregnancy, High-RiskRisk FactorsEhlers-Danlos SyndromeCase-Control StudiesPregnancy Trimester, FirstHeart Defects, CongenitalRespiratory Distress Syndrome, AdultAngelman SyndromeChromosome DisordersSevere Acute Respiratory SyndromeRestless Legs SyndromePregnancy-Associated Plasma Protein-AJob SyndromeWiskott-Aldrich SyndromeChorionic Gonadotropin, beta Subunit, HumanParaneoplastic SyndromesRetrospective StudiesSweet SyndromeFalse Positive ReactionsAcquired Immunodeficiency SyndromeBiological MarkersPaternal AgePrevalenceTreatment OutcomeChurg-Strauss SyndromeSturge-Weber SyndromeGenetic TestingBudd-Chiari SyndromeChediak-Higashi SyndromeMosaicismBrainProspective StudiesFaciesWolff-Parkinson-White SyndromeTime FactorsKallmann SyndromeSick Sinus SyndromeStevens-Johnson SyndromeHand Deformities, CongenitalSezary SyndromeFelty SyndromeUsher SyndromesHeart Septal DefectsBeckwith-Wiedemann Syndrome