A compound attribute that is the ratio of amount of linker for activation of T-cells family member 1 (human) in blood to amount of platelet-derived growth factor subunit A (human) in blood. The trait is Ontology of Biological Attributes identifier OBA_2054940 (LAT/PDGFA protein level ratio in blood). Also known as: the ratio of amount of linker for activation of T-cells family member 1 (human) in blood to amount of platelet-derived growth factor subunit A (human) in blood.