Platelet interaction with the VWF coated–surface is independent of donor plasma VWF levels. There was no correlation between donor plasma VWF level and mean translocation distance (Y = −0.0009395*X + 8.529; linear regression model) (A) or mean translocation velocity (Y = −0.000699*X + 4.174; linear regression model) (B). Blue squares represent non-O donors; red circles represent type O donors.