A compound attribute that is the ratio of amount of bone marrow stromal antigen 2 (human) in blood to amount of cell adhesion molecule CEACAM1 (human) in blood. The trait is BST2/CEACAM1 protein level ratio in blood (Ontology of Biological Attributes entry OBA_2053161). Also known as: the ratio of amount of bone marrow stromal antigen 2 (human) in blood to amount of cell adhesion molecule CEACAM1 (human) in blood.