ICOSLG/PDCD1LG2 protein level ratio in blood (OBA_2054345) can be described as follows. A compound attribute that is the ratio of amount of ICOS ligand (human) in blood to amount of programmed cell death 1 ligand 2 (human) in blood. Also known as: the ratio of amount of ICOS ligand (human) in blood to amount of programmed cell death 1 ligand 2 (human) in blood.