The amount of a Ral guanine nucleotide dissociation stimulator-like 2 when measured in blood. The trait is level of Ral guanine nucleotide dissociation stimulator-like 2 in blood (OBA_2051686, an Ontology of Biological Attributes term). Also known as: blood Ral guanine nucleotide dissociation stimulator-like 2 amount.