A compound attribute that is the ratio of amount of B-cell receptor CD22 (human) in blood to amount of low affinity immunoglobulin epsilon Fc receptor (human) in blood. The trait is CD22/FCER2 protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2055370). Also known as: the ratio of amount of B-cell receptor CD22 (human) in blood to amount of low affinity immunoglobulin epsilon Fc receptor (human) in blood.