level of Phosphatidylcholine (O-16:1_16:0) in blood serum (OBA_2045118, an Ontology of Biological Attributes identifier) is the amount of a Phosphatidylcholine (O-16:1_16:0) when measured in blood serum. Also known as: blood serum Phosphatidylcholine (O-16:1_16:0) amount.