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

A New von Willebrand Factor Activity Assay and Testing Algorithm

Summary of External Quality Assessment of VWF:RCo

Slide 5

June 2011

These problems are invincible in multiple US and international external quality assurance programs. As summarized in this table, this VWF ristocetin cofactor activity assay has poor precision among participating laboratories in US, UK, Australia and non-Western countries.

External Quality Assessment Summary


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