What method do you use to measure von Willebrand factor activity?

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Ristocetin cofactor (VWF:RCo)

Collagen binding assay (VWF:CB)

VWF activity immunoassay (VWF:Act)

Ristoectin-triggered recombinant GP Ib immunoassay (VWF:GPIbR)

Non-ristocetin gain of function GP Ib immunoassay (VWF:GPIbM)