A compound attribute that is the ratio of amount of urokinase-type plasminogen activator (human) in blood to amount of urokinase plasminogen activator surface receptor (human) in blood. The trait is Ontology of Biological Attributes entry OBA_2053510 (PLAU/PLAUR protein level ratio in blood). Also known as: the ratio of amount of urokinase-type plasminogen activator (human) in blood to amount of urokinase plasminogen activator surface receptor (human) in blood.