The amount of a PC(16:0_18:1) when measured in blood serum. The trait is Ontology of Biological Attributes entry OBA_2045070 (level of Phosphatidylcholine (16:0_18:1) in blood serum). Also known as: blood serum PC(16:0_18:1) amount, level of PC(16:0_18:1) in blood serum.