A compound attribute that is the ratio of amount of receptor tyrosine-protein kinase erbB-4 (human) in blood to amount of uromodulin (human) in blood. The trait is ERBB4/UMOD protein level ratio in blood (OBA_2054736, an Ontology of Biological Attributes id). Also known as: the ratio of amount of receptor tyrosine-protein kinase erbB-4 (human) in blood to amount of uromodulin (human) in blood.