Quantification of the amount of 1-(1-enyl-palmitoyl)-2-arachidonoyl-GPE (P-16:0/20:4) in a sample. The trait is Experimental Factor Ontology term EFO_0800417 (1-(1-enyl-palmitoyl)-2-arachidonoyl-GPE (P-16:0/20:4) measurement).