A compound attribute that is the ratio of amount of islet cell autoantigen 1 (human) in blood to amount of protein sprouty homolog 2 (human) in blood. The trait is ICA1/SPRY2 protein level ratio in blood (OBA_2052981, an Ontology of Biological Attributes entry). Also known as: the ratio of amount of islet cell autoantigen 1 (human) in blood to amount of protein sprouty homolog 2 (human) in blood.