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This assay evaluates propeptide antigen levels. This result should be correlated with VWF antigen, VWF GPIbM, VWF multimers, and clinical history by the ordering physician to arrive at the appropriate diagnosis. USA test status: This is a laboratory developed test (LDT). 

Functional/Serologic Test

Citrated Plasma (light blue top)

0.5 ml

0.3 ml

ELISA

7 days

Yes

No