Ontology of Biological Attributes id OBA_2052961 (HSPG2/IGFBP6 protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of basement membrane-specific heparan sulfate proteoglycan core protein (human) in blood to amount of insulin-like growth factor-binding protein 6 (human) in blood. Also known as: the ratio of amount of basement membrane-specific heparan sulfate proteoglycan core protein (human) in blood to amount of insulin-like growth factor-binding protein 6 (human) in blood.