CA1/HMBS protein level ratio in blood (OBA_2055731) can be described as follows. A compound attribute that is the ratio of amount of carbonic anhydrase 1 (human) in blood to amount of porphobilinogen deaminase (human) in blood. Also known as: the ratio of amount of carbonic anhydrase 1 (human) in blood to amount of porphobilinogen deaminase (human) in blood.