A compound attribute that is the ratio of amount of amyloid-beta precursor protein (human) in blood to amount of proheparin-binding EGF-like growth factor (human) in blood. The trait is Ontology of Biological Attributes id OBA_2053913 (APP/HBEGF protein level ratio in blood). Also known as: the ratio of amount of amyloid-beta precursor protein (human) in blood to amount of proheparin-binding EGF-like growth factor (human) in blood.