A compound attribute that is the ratio of amount of Crk-like protein (human) in blood to amount of leukocyte elastase inhibitor (human) in blood. The trait is CRKL/SERPINB1 protein level ratio in blood (Ontology of Biological Attributes entry OBA_2054504). Also known as: the ratio of amount of Crk-like protein (human) in blood to amount of leukocyte elastase inhibitor (human) in blood.