HematocritHemodilutionBlood ViscosityHemoglobinsErythrocyte CountPlasma VolumeAnemiaErythropoietinPolycythemiaErythrocyte VolumeBlood VolumeExchange Transfusion, Whole BloodDisabled PersonsErythrocyte IndicesErythrocytesBloodlettingHematologic TestsHemoglobinometryErythrocyte AggregationBlood Cell CountPlasma SubstitutesIronErythrocyte TransfusionBlood Chemical AnalysisReticulocyte CountBlood PressureTime FactorsOxygenBlood TransfusionErythropoiesisBlood Volume DeterminationRisk FactorsUnited StatesPhlebotomyHemorheologyBlood ProteinsKidney Failure, ChronicRenal DialysisAnemia, NeonatalAltitudeErythrocyte DeformabilityIsotonic SolutionsProspective StudiesSerum AlbuminDehydrationPlatelet CountHomeless PersonsBody WeightAnemia, HypochromicAge FactorsHydroxyethyl Starch DerivativesReference ValuesBlood SubstitutesHemodynamicsCapillariesBlood Transfusion, AutologousFerritinsMentally Ill PersonsBlood Flow VelocityPolycythemia VeraMicrocirculationCohort StudiesSex FactorsBlood Loss, SurgicalVisually Impaired PersonsPrevalenceEaglesRetrospective StudiesRegression AnalysisMentally Disabled PersonsIncidenceRheologyBlood Specimen CollectionLeukocyte CountCerebrovascular CirculationInfant, NewbornAnemia, Iron-DeficiencyCross-Sectional StudiesOxygen Consumption