How Does Ristocetin Cofactor Assay Work?

How Does Ristocetin Cofactor Assay Work? Ristocetin cofactor assay uses the patient’s platelet poor plasma (with vWF but no platelets) and adds ristocetin and exogenous formalin-fixed platelets which can passively agglutinate (but not actively aggregate, as they are dead). What is ristocetin cofactor assay? The Von Willebrand Ristocetin Cofactor [vWF:RCo] assay measures the ability of