factor VIIIag(1) von Willebrand factor antigen (vWFag)—The antigenic expression of vWF as measured by immunoassays using heterologous antigens.
(2) Factor VIIIag (in current use)—The antigenic expression of factor VIII measured by immunoassays using homologous antibodies.
(3) von Willebrand factor (vWF)—The protein that is defective or absent in von Willebrand's disease.
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