CD27/TNFRSF13B protein level ratio in blood (Ontology of Biological Attributes id OBA_2055290) can be described as follows. A compound attribute that is the ratio of amount of CD27 antigen (human) in blood to amount of tumor necrosis factor receptor superfamily member 13B (human) in blood. Also known as: the ratio of amount of CD27 antigen (human) in blood to amount of tumor necrosis factor receptor superfamily member 13B (human) in blood.