von Willebrand factor.activity actual/Normal:RelRto:Pt:PPP^Control:Qn:IA
von willebrand factor.activity actual/normal:relrto:pt:ppp^control:qn:ia
von Willebrand factor.activity actual/Normal:Relative Ratio:To identify measures at a point in time:Platelet poor plasma^Control:Quantitative:Immunoassay
von willebrand factor.activity actual/normal:relative ratio:to identify measures at a point in time:platelet poor plasma^control:quantitative:immunoassay