A compound attribute that is the ratio of amount of caspase-8 (human) in blood to amount of septin-9 (human) in blood. The trait is Ontology of Biological Attributes term OBA_2054793 (CASP8/SEPTIN9 protein level ratio in blood). Also known as: the ratio of amount of caspase-8 (human) in blood to amount of septin-9 (human) in blood.