A compound attribute that is the ratio of amount of calcium-regulated heat-stable protein 1 (human) in blood to amount of porphobilinogen deaminase (human) in blood. The trait is CARHSP1/HMBS protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2054855). Also known as: the ratio of amount of calcium-regulated heat-stable protein 1 (human) in blood to amount of porphobilinogen deaminase (human) in blood.