A compound attribute that is the ratio of amount of sortilin (human) in blood to amount of V-type immunoglobulin domain-containing suppressor of T-cell activation (human) in blood. The trait is SORT1/VSIR protein level ratio in blood (OBA_2055697, an Ontology of Biological Attributes entry). Also known as: the ratio of amount of sortilin (human) in blood to amount of V-type immunoglobulin domain-containing suppressor of T-cell activation (human) in blood.