A compound attribute that is the ratio of amount of TBC1 domain family member 5 (human) in blood to amount of ubiquitin carboxyl-terminal hydrolase 8 (human) in blood. The trait is TBC1D5/USP8 protein level ratio in blood (OBA_2053037, an Ontology of Biological Attributes term). Also known as: the ratio of amount of TBC1 domain family member 5 (human) in blood to amount of ubiquitin carboxyl-terminal hydrolase 8 (human) in blood.