A compound attribute that is the ratio of amount of protocadherin-1 (human) in blood to amount of tumor necrosis factor receptor superfamily member 11A (human) in blood. The trait is PCDH1/TNFRSF11A protein level ratio in blood (Ontology of Biological Attributes term OBA_2054039). Also known as: the ratio of amount of protocadherin-1 (human) in blood to amount of tumor necrosis factor receptor superfamily member 11A (human) in blood.