A compound attribute that is the ratio of amount of low affinity immunoglobulin epsilon Fc receptor (human) in blood to amount of trem-like transcript 2 protein (human) in blood. The trait is FCER2/TREML2 protein level ratio in blood (OBA_2055214). Also known as: the ratio of amount of low affinity immunoglobulin epsilon Fc receptor (human) in blood to amount of trem-like transcript 2 protein (human) in blood.