A compound attribute that is the ratio of amount of serine protease inhibitor Kazal-type 1 (human) in blood to amount of trefoil factor 3 (human) in blood. The trait is SPINK1/TFF3 protein level ratio in blood (Ontology of Biological Attributes entry OBA_2055703). Also known as: the ratio of amount of serine protease inhibitor Kazal-type 1 (human) in blood to amount of trefoil factor 3 (human) in blood.