A compound attribute that is the ratio of amount of lymphocyte antigen 6D (human) in blood to amount of WAP four-disulfide core domain protein 12 (human) in blood. The trait is LY6D/WFDC12 protein level ratio in blood (Ontology of Biological Attributes id OBA_2053877). Also known as: the ratio of amount of lymphocyte antigen 6D (human) in blood to amount of WAP four-disulfide core domain protein 12 (human) in blood.