A compound attribute that is the ratio of amount of platelet-derived growth factor subunit B (human) in blood to amount of Kunitz-type protease inhibitor 2 (human) in blood. The trait is PDGFB/SPINT2 protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2054060). Also known as: the ratio of amount of platelet-derived growth factor subunit B (human) in blood to amount of Kunitz-type protease inhibitor 2 (human) in blood.