A compound attribute that is the ratio of amount of R-spondin-1 (human) in blood to amount of secreted frizzled-related protein 1 (human) in blood. The trait is RSPO1/SFRP1 protein level ratio in blood (OBA_2053158). Also known as: the ratio of amount of R-spondin-1 (human) in blood to amount of secreted frizzled-related protein 1 (human) in blood.