SDC4/SEMA4D protein level ratio in blood (OBA_2055745) can be described as follows. A compound attribute that is the ratio of amount of syndecan-4 (human) in blood to amount of semaphorin-4D (human) in blood. Also known as: the ratio of amount of syndecan-4 (human) in blood to amount of semaphorin-4D (human) in blood.