HAGH/HMBS protein level ratio in blood (OBA_2053126, an Ontology of Biological Attributes term) can be described as follows. A compound attribute that is the ratio of amount of hydroxyacylglutathione hydrolase, mitochondrial (human) in blood to amount of porphobilinogen deaminase (human) in blood. Also known as: the ratio of amount of hydroxyacylglutathione hydrolase, mitochondrial (human) in blood to amount of porphobilinogen deaminase (human) in blood.