A compound attribute that is the ratio of amount of lithostathine-1-alpha (human) in blood to amount of serine protease inhibitor Kazal-type 1 (human) in blood. The trait is REG1A/SPINK1 protein level ratio in blood (OBA_2053230). Also known as: the ratio of amount of lithostathine-1-alpha (human) in blood to amount of serine protease inhibitor Kazal-type 1 (human) in blood.