A compound attribute that is the ratio of amount of vascular endothelial growth factor receptor 2 (human) in blood to amount of von Willebrand factor (human) in blood. The trait is Ontology of Biological Attributes identifier OBA_2055499 (KDR/VWF protein level ratio in blood). Also known as: the ratio of amount of vascular endothelial growth factor receptor 2 (human) in blood to amount of von Willebrand factor (human) in blood.