Platelet TransfusionBlood PlateletsPlatelet AggregationPlatelet CountBlood TransfusionThrombocytopeniaPlateletpheresisErythrocyte TransfusionAntigens, Human PlateletPlatelet AdhesivenessPlatelet Membrane GlycoproteinsBlood Component TransfusionThrombocytopenia, Neonatal AlloimmuneIsoantibodiesPlatelet Factor 4ThrombinBlood Transfusion, IntrauterineBlood Transfusion, AutologousHemorrhageBlood PreservationBlood Grouping and CrossmatchingPlatelet Glycoprotein GPIIb-IIIa ComplexPlatelet Activating FactorExchange Transfusion, Whole BloodPlatelet Glycoprotein GPIb-IX ComplexPlatelet Function TestsAdenosine DiphosphateHematologyMegakaryocytesBleeding TimeBlood Component RemovalHemostasisThrombastheniaThrombopoietinBlood DonorsFibrinogenBlood Group IncompatibilityAnemia, AplasticThromboxane A2ThrombopoiesisPlatelet ActivationFetofetal TransfusionP-SelectinAnemia, RefractoryBlood Loss, SurgicalSerotoninProstaglandin Endoperoxides, SyntheticLeukemiavon Willebrand FactorTime FactorsCollagenHLA AntigensThrombosisThrombelastographyInterleukin-11LeukapheresisPurpura, Thrombocytopenic, IdiopathicAspirinHematopoietic Stem Cell TransplantationPancytopeniaPlatelet Membrane Glycoprotein IIbABO Blood-Group SystemReceptors, Purinergic P2Y12Platelet Factor 3NeonatologyTreatment OutcomeBlood CoagulationGranulocyte Colony-Stimulating FactorCalciumReceptors, ThromboxaneRetrospective StudiesSplenectomyThromboxanesRecombinant ProteinsHistocompatibility TestingRistocetin15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidBone Marrow TransplantationReceptors, ThrombinIsoantigensEpinephrineBlood Coagulation FactorsArachidonic AcidsCytoplasmic GranulesBlood ProteinsTransplantation, AutologousKineticsCrotalid VenomsLeukocyte TransfusionDisseminated Intravascular CoagulationLeukemia, MyeloidProstaglandins HBlood BanksEpoprostenolAcute DiseaseAntibodiesLeukocytesPlatelet Storage Pool DeficiencyCyclophosphamideProspective Studies