DKK1/SDC4 protein level ratio in blood (Ontology of Biological Attributes id OBA_2053984) can be described as follows. A compound attribute that is the ratio of amount of dickkopf-related protein 1 (human) in blood to amount of syndecan-4 (human) in blood. Also known as: the ratio of amount of dickkopf-related protein 1 (human) in blood to amount of syndecan-4 (human) in blood.