LDLR/MEGF9 protein level ratio in blood (OBA_2054915) can be described as follows. A compound attribute that is the ratio of amount of low-density lipoprotein receptor (human) in blood to amount of multiple epidermal growth factor-like domains protein 9 (human) in blood. Also known as: the ratio of amount of low-density lipoprotein receptor (human) in blood to amount of multiple epidermal growth factor-like domains protein 9 (human) in blood.