The amount of a Phosphatidylethanolamine (18:1_0:0) when measured in blood serum. The trait is Ontology of Biological Attributes entry OBA_2045141 (level of Phosphatidylethanolamine (18:1_0:0) in blood serum). Also known as: blood serum Phosphatidylethanolamine (18:1_0:0) amount.