Anemia, Sickle CellSickle Cell TraitHemoglobin SC DiseaseAntisickling AgentsHemoglobin, SickleErythrocytesBlood CellsFetal HemoglobinAcute Chest SyndromeHydroxyureaErythrocytes, AbnormalHemolysisJamaicabeta-ThalassemiaThalassemiaErythrocyte TransfusionPriapismHemoglobinsErythrocyte CountBlood TransfusionHemoglobinopathiesBlood Cell CountErythrocyte DeformabilityExchange Transfusion, Whole BloodLeg UlcerErythrocyte MembranePainReticulocyte CountErythrocyte AggregationHemoglobin C DiseaseLeukocyte CountHematocritVascular DiseasesErythrocyte AgingAnemia, HemolyticMastocytosisHemoglobin Aalpha-ThalassemiaGlobinsUrticaria PigmentosaSplenic DiseasesLeukocytesBlood ViscosityHypertension, PulmonaryLutheran Blood-Group SystemHomozygoteErythrocyte Indicesbeta-GlobinsIron OverloadHemoglobin SubunitsPregnancy Complications, HematologicTricuspid Valve InsufficiencyHemorheologygamma-GlobinsErythrocyte VolumeOxyhemoglobinsOsmotic FragilityBlood Grouping and CrossmatchingOxygenHematologic TestsIsoantibodiesEmbolism, FatErythroid Precursor CellsPhlebotomy2,3-DiphosphoglycerateRh-Hr Blood-Group SystemReticulocytesSplenectomyMethemoglobinPremarital ExaminationsRetrospective StudiesTime FactorsMastocytosis, SystemicErythropoiesisBiological MarkersSpherocytosis, HereditaryLung DiseasesAcute DiseaseHemoglobin CMicrocirculationLeukocytosisInfant, NewbornBahrainIron Chelating AgentsFetal BloodSplenomegalyChelation TherapyBlood PreservationHemoglobins, Abnormaldelta-GlobinsProspective StudiesMice, TransgenicUltrasonography, Doppler, TranscranialGeorgiaCase-Control StudiesSaudi ArabiaNeonatal ScreeningFemur Head NecrosisNitric OxideRisk Factors