The amount of a 1-(1Z-hexadecenyl)-sn-glycero-3-phosphocholine when measured in blood. The trait is OBA_2050376 (level of 1-(1Z-hexadecenyl)-sn-glycero-3-phosphocholine in blood). Also known as: blood 1-(1Z-hexadecenyl)-sn-glycero-3-phosphocholine amount.