A compound attribute that is the ratio of amount of scavenger receptor class F member 1 (human) in blood to amount of sushi domain-containing protein 1 (human) in blood. The trait is SCARF1/SUSD1 protein level ratio in blood (OBA_2055688). Also known as: the ratio of amount of scavenger receptor class F member 1 (human) in blood to amount of sushi domain-containing protein 1 (human) in blood.