PDGFB/SPARC protein level ratio in blood (Ontology of Biological Attributes id OBA_2054059) can be described as follows. A compound attribute that is the ratio of amount of platelet-derived growth factor subunit B (human) in blood to amount of SPARC protein (human) in blood. Also known as: the ratio of amount of platelet-derived growth factor subunit B (human) in blood to amount of SPARC protein (human) in blood.