HematocritHemodilutionBlood ViscosityErythrocyte CountHemoglobinsPlasma VolumeAnemiaErythropoietinPolycythemiaErythrocyte VolumeBlood VolumeExchange Transfusion, Whole BloodErythrocytesErythrocyte IndicesHematologic TestsBloodlettingHemoglobinometryBlood Cell CountErythrocyte AggregationTime FactorsPlasma SubstitutesIronErythrocyte TransfusionBlood Chemical AnalysisReticulocyte CountBlood PressureOxygenErythropoiesisBlood TransfusionBlood Volume DeterminationBlood ProteinsRenal DialysisKidney Failure, ChronicHemorheologyPhlebotomyBody WeightSerum AlbuminAnemia, NeonatalErythrocyte DeformabilityIsotonic SolutionsAltitudeRetrospective StudiesProspective StudiesDehydrationPlatelet CountPregnancyAnemia, HypochromicCapillariesHemodynamicsInfant, NewbornHydroxyethyl Starch DerivativesBlood SubstitutesReference ValuesTreatment OutcomeRisk FactorsBlood Transfusion, AutologousFerritinsLeukocyte CountPolycythemia VeraBlood Flow VelocityMicrocirculationBlood Loss, SurgicalAge FactorsEaglesRegression AnalysisRheologyOxygen ConsumptionRecombinant ProteinsAnemia, Iron-DeficiencyCerebrovascular CirculationBlood Specimen CollectionPlasmaKidneyRandom AllocationRegional Blood Flow