A compound attribute that is the ratio of amount of plasminogen activator inhibitor 1 (human) in blood to amount of SPARC protein (human) in blood. The trait is Ontology of Biological Attributes term OBA_2055761 (SERPINE1/SPARC protein level ratio in blood). Also known as: the ratio of amount of plasminogen activator inhibitor 1 (human) in blood to amount of SPARC protein (human) in blood.