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Von Willebrand Disease (VWD)
Part 3: VWF Activity Assay

A New von Willebrand Factor Activity Assay and Testing Algorithm

VWF Laboratory Testing Strategy

Slide 22

June 2011

We then adopted a screening scheme to increase the accuracy and efficiency of VWD testing and at the same time decreased the testing volume of the laborious VWF ristocetin cofactor activity assay. Any sample that has less than 55 U/dL VWF antigen or latex activity, or less than 0.8 VWF latex activity over antigen ratio will be reflected for further VWF testing which includes VWF ristocetin cofactor activity and multimer analysis.

VWF Laboratory Testing Strategy


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