MANF/SDC4 protein level ratio in blood (OBA_2053823) can be described as follows. A compound attribute that is the ratio of amount of mesencephalic astrocyte-derived neurotrophic factor (human) in blood to amount of syndecan-4 (human) in blood. Also known as: the ratio of amount of mesencephalic astrocyte-derived neurotrophic factor (human) in blood to amount of syndecan-4 (human) in blood.