The amount of a 1-(1Z)-hexadecenyl-2-arachidonoyl-sn-glycero-3-phosphocholine when measured in blood. The trait is level of 1-(1Z)-hexadecenyl-2-arachidonoyl-sn-glycero-3-phosphocholine in blood (Ontology of Biological Attributes entry OBA_2050378). Also known as: blood 1-(1Z)-hexadecenyl-2-arachidonoyl-sn-glycero-3-phosphocholine amount.