A compound attribute that is the ratio of amount of egl nine homolog 1 (human) in blood to amount of PC4 and SFRS1-interacting protein (human) in blood. The trait is Ontology of Biological Attributes entry OBA_2055664 (EGLN1/PSIP1 protein level ratio in blood). Also known as: the ratio of amount of egl nine homolog 1 (human) in blood to amount of PC4 and SFRS1-interacting protein (human) in blood.