CEACAM5/SFTPA2 protein level ratio in blood (Ontology of Biological Attributes term OBA_2054245) can be described as follows. A compound attribute that is the ratio of amount of cell adhesion molecule CEACAM5 (human) in blood to amount of pulmonary surfactant-associated protein A2 (human) in blood. Also known as: the ratio of amount of cell adhesion molecule CEACAM5 (human) in blood to amount of pulmonary surfactant-associated protein A2 (human) in blood.