F7/F9 protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2055416) can be described as follows. A compound attribute that is the ratio of amount of coagulation factor VII (human) in blood to amount of coagulation factor IX (human) in blood. Also known as: the ratio of amount of coagulation factor VII (human) in blood to amount of coagulation factor IX (human) in blood.