1-stearoyl-2-dihomo-linolenoyl-GPI (18:0/20:3n3 or 6) measurement (Experimental Factor Ontology id EFO_0022085) is quantification of the amount of 1-stearoyl-2-dihomo-linolenoyl-GPI (18:0/20:3n3 or 6) in a sample.