CTSZ/IDUA protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2054626) can be described as follows. A compound attribute that is the ratio of amount of cathepsin Z (human) in blood to amount of alpha-L-iduronidase (human) in blood. Also known as: the ratio of amount of cathepsin Z (human) in blood to amount of alpha-L-iduronidase (human) in blood.