CordocentesisBlood Gas AnalysisFetusFetal BloodCarbon DioxideOxygenAcid-Base ImbalanceGasesPartial PressureCapnographyPulmonary Gas ExchangeBlood Specimen CollectionBlood Gas Monitoring, TranscutaneousOximetryRespiratory InsufficiencyHepatopulmonary SyndromePregnancyRespiratory Dead SpaceMaternal-Fetal ExchangeRespirationBlood Transfusion, IntrauterineHypoventilationRespiratory Function TestsMethemoglobinemiaVentilation-Perfusion RatioAcid-Base EquilibriumFetomaternal TransfusionOxygen ConsumptionHypercapniaFetal DiseasesHydrogen-Ion ConcentrationAnoxiaOxyhemoglobinsRh IsoimmunizationErythroblastosis, FetalRespiration, ArtificialOxygen Inhalation TherapyPlacentaHeart Rate, FetalLungAnesthesia, GeneralFetal HypoxiaFetoscopyAmniotic FluidPulmonary EmbolismGestational AgeRadiography, ThoracicExercise TestLung DiseasesPrenatal DiagnosisSpirometrySheepPulmonary Disease, Chronic ObstructiveProspective StudiesPositive-Pressure RespirationBicarbonatesHemodynamicsHydrops FetalisUmbilical ArteriesVital CapacityArteriesForced Expiratory VolumeBlood PressureAcute DiseaseHeart RateObesity Hypoventilation SyndromeInfant, NewbornSyringesPlacental CirculationFetal Growth RetardationPregnancy, AnimalPregnancy Trimester, ThirdFetal WeightTime FactorsUmbilical CordCardiotocographyUltrasonography, PrenatalAcidosisSwineFetal DeathLung Diseases, ObstructiveFetal Stem CellsRetrospective StudiesVitamin K Deficiency BleedingPregnancy Trimester, SecondHemoglobinsChromatography, GasPoint-of-Care SystemsPulmonary VentilationAnesthesia, ObstetricalTreatment OutcomeLabor, ObstetricNoble GasesGas Chromatography-Mass SpectrometryPredictive Value of TestsExercise ToleranceCardiac OutputFetal HemoglobinMonitoring, PhysiologicDisease Models, Animal