A compound attribute that is the ratio of amount of interleukin-18-binding protein (human) in blood to amount of paired immunoglobulin-like type 2 receptor alpha (human) in blood. The trait is IL18BP/PILRA protein level ratio in blood (OBA_2054424). Also known as: the ratio of amount of interleukin-18-binding protein (human) in blood to amount of paired immunoglobulin-like type 2 receptor alpha (human) in blood.