Fetal BloodCordocentesisFetusPregnancyMaternal-Fetal ExchangeBlood Transfusion, IntrauterineFetomaternal TransfusionFetal DiseasesRh IsoimmunizationErythroblastosis, FetalPlacentaFetoscopyAmniotic FluidHeart Rate, FetalArachidonate 15-LipoxygenaseFetal HypoxiaGestational AgeHydrops FetalisSheepUmbilical ArteriesBlood Specimen CollectionPlacental CirculationFetal Growth RetardationPregnancy Trimester, ThirdFetal WeightPregnancy, AnimalUmbilical CordCardiotocographyUltrasonography, PrenatalFetal DeathCircle of WillisVitamin K Deficiency BleedingPregnancy Trimester, SecondBlood Gas AnalysisLabor, ObstetricFetal HemoglobinHemoglobinopathiesErythema InfectiosumUltrasonography, DopplerInfant, NewbornFetal HeartAmniocentesisAcidosisAnesthesia, ObstetricalFetofetal TransfusionUmbilical VeinsFetal DevelopmentCholestanesBlood Flow VelocityChorionic VilliErythroblastsPregnancy Trimester, FirstEmbryonic and Fetal DevelopmentUterusPulsatile FlowHematocritOxygenUltrasonographyCesarean SectionCarbon DioxideHemoglobinsBlood VolumeTrophoblastsAdrenocorticotropic HormoneHematopoietic Stem CellsModels, AnimalRegional Blood FlowHydrogen-Ion ConcentrationBlood PressureHydrocortisoneThymus GlandErythrocytesReference ValuesBlood GlucoseLiverMice, Inbred C57BLT-Lymphocytes