The amount of a phosphatidylcholine 16:0_16:0 when measured in blood serum. The trait is level of Phosphatidylcholine (16:0_16:0) in blood serum (OBA_2045067, an Ontology of Biological Attributes id). Also known as: blood serum phosphatidylcholine 16:0_16:0 amount, level of phosphatidylcholine 16:0_16:0 in blood serum.