level of Phosphatidylcholine (16:1_18:1) in blood serum (OBA_2045082, an Ontology of Biological Attributes id) is the amount of a PC(16:1_18:1) when measured in blood serum. Also known as: blood serum PC(16:1_18:1) amount, level of PC(16:1_18:1) in blood serum.