FLT1/VEGFA protein level ratio in blood (Ontology of Biological Attributes entry OBA_2055258) can be described as follows. A compound attribute that is the ratio of amount of vascular endothelial growth factor receptor 1 (human) in blood to amount of vascular endothelial growth factor A, long form (human) in blood. Also known as: the ratio of amount of vascular endothelial growth factor receptor 1 (human) in blood to amount of vascular endothelial growth factor A, long form (human) in blood.