A compound attribute that is the ratio of amount of Kunitz-type protease inhibitor 2 (human) in blood to amount of V-type immunoglobulin domain-containing suppressor of T-cell activation (human) in blood. The trait is SPINT2/VSIR protein level ratio in blood (OBA_2055707). Also known as: the ratio of amount of Kunitz-type protease inhibitor 2 (human) in blood to amount of V-type immunoglobulin domain-containing suppressor of T-cell activation (human) in blood.