A compound attribute that is the ratio of amount of platelet glycoprotein Ib alpha chain (human) in blood to amount of syndecan-4 (human) in blood. The trait is Ontology of Biological Attributes id OBA_2053415 (GP1BA/SDC4 protein level ratio in blood). Also known as: the ratio of amount of platelet glycoprotein Ib alpha chain (human) in blood to amount of syndecan-4 (human) in blood.