SPINT1/SUSD2 protein level ratio in blood (Ontology of Biological Attributes term OBA_2055705) can be described as follows. A compound attribute that is the ratio of amount of Kunitz-type protease inhibitor 1 (human) in blood to amount of sushi domain-containing protein 2 (human) in blood. Also known as: the ratio of amount of Kunitz-type protease inhibitor 1 (human) in blood to amount of sushi domain-containing protein 2 (human) in blood.