Blood Transfusion, IntrauterineBlood PlateletsPlatelet AggregationPlatelet CountPlatelet AdhesivenessPlatelet Membrane GlycoproteinsPlatelet Factor 4Platelet TransfusionPlatelet Activating FactorPlatelet Function TestsPlatelet Glycoprotein GPIIb-IIIa ComplexPlatelet Glycoprotein GPIb-IX ComplexThrombinAdenosine DiphosphateAntigens, Human PlateletThrombocytopenia