A compound attribute that is the ratio of amount of CD27 antigen (human) in blood to amount of intercellular adhesion molecule 3 (human) in blood. The trait is CD27/ICAM3 protein level ratio in blood (OBA_2055387, an Ontology of Biological Attributes id). Also known as: the ratio of amount of CD27 antigen (human) in blood to amount of intercellular adhesion molecule 3 (human) in blood.