CKAP4/LTBR protein level ratio in blood (OBA_2054972, an Ontology of Biological Attributes identifier) can be described as follows. A compound attribute that is the ratio of amount of cytoskeleton-associated protein 4 (human) in blood to amount of tumor necrosis factor receptor superfamily member 3 (human) in blood. Also known as: the ratio of amount of cytoskeleton-associated protein 4 (human) in blood to amount of tumor necrosis factor receptor superfamily member 3 (human) in blood.