HBQ1/HMBS protein level ratio in blood (OBA_2053009, an Ontology of Biological Attributes entry) can be described as follows. A compound attribute that is the ratio of amount of hemoglobin subunit theta-1 (human) in blood to amount of porphobilinogen deaminase (human) in blood. Also known as: the ratio of amount of hemoglobin subunit theta-1 (human) in blood to amount of porphobilinogen deaminase (human) in blood.