“…Moreover clot strength, as measured by clot amplitude, depends not only on platelets, but also on fibrinogen and factor XIII concentrations, although the relative contribution of platelets is approximately 80% [21]. Based on clot elasticity, platelet contribution is 87-94% [25]. Secondly, the quantity of von Willebrand factor may impact clot stability and resulting bleeding time [19], postoperative blood loss [26], however in the present study its concentration was not measured.…”