SCAMP3/TBC1D23 protein level ratio in blood (OBA_2053323, an Ontology of Biological Attributes term) can be described as follows. A compound attribute that is the ratio of amount of secretory carrier-associated membrane protein 3 (human) in blood to amount of TBC1 domain family member 23 (human) in blood. Also known as: the ratio of amount of secretory carrier-associated membrane protein 3 (human) in blood to amount of TBC1 domain family member 23 (human) in blood.