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

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Ristocetin cofactor (VWF:RCo)
65% (24 votes)
Collagen binding assay (VWF:CB)
3% (1 vote)
VWF activity immunoassay (VWF:Act)
24% (9 votes)
Ristoectin-triggered recombinant GP Ib immunoassay (VWF:GPIbR)
3% (1 vote)
Non-ristocetin gain of function GP Ib immunoassay (VWF:GPIbM)
5% (2 votes)
Total votes: 37