MIF/SUSD2 protein level ratio in blood (OBA_2054462, an Ontology of Biological Attributes term) can be described as follows. A compound attribute that is the ratio of amount of macrophage migration inhibitory factor (human) in blood to amount of sushi domain-containing protein 2 (human) in blood. Also known as: the ratio of amount of macrophage migration inhibitory factor (human) in blood to amount of sushi domain-containing protein 2 (human) in blood.