PDGFB/SDC4 protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2054057) 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 syndecan-4 (human) in blood. Also known as: the ratio of amount of platelet-derived growth factor subunit B (human) in blood to amount of syndecan-4 (human) in blood.