ESAM/THPO protein level ratio in blood (Ontology of Biological Attributes term OBA_2054763) can be described as follows. A compound attribute that is the ratio of amount of endothelial cell-selective adhesion molecule (human) in blood to amount of thrombopoietin (human) in blood. Also known as: the ratio of amount of endothelial cell-selective adhesion molecule (human) in blood to amount of thrombopoietin (human) in blood.