CD163/MARCO protein level ratio in blood (OBA_2055275, an Ontology of Biological Attributes id) can be described as follows. A compound attribute that is the ratio of amount of scavenger receptor cysteine-rich type 1 protein M130 (human) in blood to amount of macrophage receptor MARCO (human) in blood. Also known as: the ratio of amount of scavenger receptor cysteine-rich type 1 protein M130 (human) in blood to amount of macrophage receptor MARCO (human) in blood.