A compound attribute that is the ratio of amount of NSFL1 cofactor p47 (human) in blood to amount of leukocyte elastase inhibitor (human) in blood. The trait is NSFL1C/SERPINB1 protein level ratio in blood (OBA_2055200, an Ontology of Biological Attributes id). Also known as: the ratio of amount of NSFL1 cofactor p47 (human) in blood to amount of leukocyte elastase inhibitor (human) in blood.