level of 1-O-oleoyl-sn-glycero-3-phosphoserine in blood serum (OBA_2045055, an Ontology of Biological Attributes id) is the amount of a 1-O-oleoyl-sn-glycero-3-phosphoserine when measured in blood serum. Also known as: blood serum 1-O-oleoyl-sn-glycero-3-phosphoserine amount.