A compound attribute that is the ratio of amount of chymotrypsin-like elastase family member 3A (human) in blood to amount of carboxypeptidase A1 (human) in blood. The trait is CELA3A/CPA1 protein level ratio in blood (Ontology of Biological Attributes term OBA_2054253). Also known as: the ratio of amount of chymotrypsin-like elastase family member 3A (human) in blood to amount of carboxypeptidase A1 (human) in blood.