CA4/PECAM1 protein level ratio in blood (OBA_2054818) can be described as follows. A compound attribute that is the ratio of amount of carbonic anhydrase 4 (human) in blood to amount of platelet endothelial cell adhesion molecule (human) in blood. Also known as: the ratio of amount of carbonic anhydrase 4 (human) in blood to amount of platelet endothelial cell adhesion molecule (human) in blood.