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Von Willebrand Disease (VWD)
Part 2: NHLBI Diagnosis Guidelines

Laboratory Recommendations

von Willebrand Disease Profile

Slide 27

June 2011

When a sample has less than 55 U/dl of VWF antigen, latex activity, or VWF activity ratio is less than 0.8, this sample, as indicated be the red lines and arrows, will be further tested by VWF ristocetin cofactor activity assay and multimer analysis.

von Willebrand Disease Profile


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