CA5A/SULT2A1 protein level ratio in blood (OBA_2054825, an Ontology of Biological Attributes identifier) can be described as follows. A compound attribute that is the ratio of amount of carbonic anhydrase 5A, mitochondrial (human) in blood to amount of sulfotransferase 2A1 (human) in blood. Also known as: the ratio of amount of carbonic anhydrase 5A, mitochondrial (human) in blood to amount of sulfotransferase 2A1 (human) in blood.