The amount of a PS(O-20:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)) when measured in blood serum. The trait is level of PS(O-20:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)) in blood serum (OBA_2045047). Also known as: blood serum PS(O-20:0/22:6(4Z,7Z,10Z,13Z,16Z,19Z)) amount.