A compound attribute that is the ratio of amount of fibroblast growth factor 19 (human) in blood to amount of secretogranin-2 (human) in blood. The trait is FGF19/SCG2 protein level ratio in blood (OBA_2055309, an Ontology of Biological Attributes entry). Also known as: the ratio of amount of fibroblast growth factor 19 (human) in blood to amount of secretogranin-2 (human) in blood.