ANG/F9 protein level ratio in blood (Ontology of Biological Attributes id OBA_2054266) can be described as follows. A compound attribute that is the ratio of amount of angiogenin (human) in blood to amount of coagulation factor IX (human) in blood. Also known as: the ratio of amount of angiogenin (human) in blood to amount of coagulation factor IX (human) in blood.