CNDP1/F9 protein level ratio in blood (Ontology of Biological Attributes term OBA_2054898) can be described as follows. A compound attribute that is the ratio of amount of beta-Ala-His dipeptidase (human) in blood to amount of coagulation factor IX (human) in blood. Also known as: the ratio of amount of beta-Ala-His dipeptidase (human) in blood to amount of coagulation factor IX (human) in blood.