Comparison of automated von Willebrand factor activity assays.
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Von Willebrand Disease (VWD) is the most common inherited bleeding disorder. Measurement of von Willebrand factor (VWF) activity in plasma is often based on platelet agglutination stimulated by the ristocetin cofactor activity. Novel assays, based on latex beads with recombinant glycoprotein Ib instead of platelets, have recently been developed but it is unclear whether these can improve the diagnostic capability for VWD.