A compound attribute that is the ratio of amount of tissue factor (human) in blood to amount of GDNF family receptor alpha-1 (human) in blood. The trait is F3/GFRA1 protein level ratio in blood (OBA_2055414, an Ontology of Biological Attributes id). Also known as: the ratio of amount of tissue factor (human) in blood to amount of GDNF family receptor alpha-1 (human) in blood.