A compound attribute that is the ratio of amount of cytoskeleton-associated protein 4 (human) in blood to amount of placenta growth factor (human) in blood. The trait is Ontology of Biological Attributes id OBA_2054973 (CKAP4/PGF protein level ratio in blood). Also known as: the ratio of amount of cytoskeleton-associated protein 4 (human) in blood to amount of placenta growth factor (human) in blood.