A compound attribute that is the ratio of amount of carbonic anhydrase 2 (human) in blood to amount of porphobilinogen deaminase (human) in blood. The trait is CA2/HMBS protein level ratio in blood (OBA_2055737). Also known as: the ratio of amount of carbonic anhydrase 2 (human) in blood to amount of porphobilinogen deaminase (human) in blood.