Platelet CountBlood PlateletsPlatelet AggregationThrombopoietinThrombocytopeniaPlatelet ActivationPlatelet AdhesivenessPlatelet TransfusionPlatelet Membrane GlycoproteinsThrombocytosisBlood Cell CountPlatelet Factor 4Purpura, Thrombocytopenic, IdiopathicLeukocyte CountPlatelet Function TestsMegakaryocytesPlatelet Glycoprotein GPIIb-IIIa ComplexPlatelet Glycoprotein GPIb-IX ComplexBleeding TimePlatelet Activating FactorPurpura, ThrombocytopenicThrombinAntigens, Human PlateletFibrinogenThrombopoiesisSplenectomyAdenosine DiphosphateThrombosisP-SelectinHemostasisCD4 Lymphocyte CountBlood CoagulationErythrocyte CountDisseminated Intravascular Coagulationvon Willebrand FactorThrombocythemia, Essential