CREG1/SMPDL3A protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2054531) can be described as follows. A compound attribute that is the ratio of amount of protein CREG1 (human) in blood to amount of cyclic GMP-AMP phosphodiesterase SMPDL3A (human) in blood. Also known as: the ratio of amount of protein CREG1 (human) in blood to amount of cyclic GMP-AMP phosphodiesterase SMPDL3A (human) in blood.