Evidence that the platelet retention factor is separate from the factor VIII-related antigen and factor VIII.


Plasmas from a pregnant patient with von Willebrand's disease and from a patient with von Willebrand's disease who is taking Premarin had elevated levels of Factor VIII-related antigen and Factor VIII activity without any improvement in their platelet retention abnormality. When these were added to the blood from nonpregnant patients with von Willebrand's… (More)


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