A compound attribute that is the ratio of amount of angiopoietin-1 (human) in blood to amount of plasminogen activator inhibitor 1 (human) in blood. The trait is ANGPT1/SERPINE1 protein level ratio in blood (OBA_2054276, an Ontology of Biological Attributes identifier). Also known as: the ratio of amount of angiopoietin-1 (human) in blood to amount of plasminogen activator inhibitor 1 (human) in blood.