The amount of a 1-O-(1Z-eicosenyl)-sn-glycero-3-phospho-1D-myo-inositol when measured in blood serum. The trait is Ontology of Biological Attributes term OBA_2045060 (level of 1-O-(1Z-eicosenyl)-sn-glycero-3-phospho-1D-myo-inositol in blood serum). Also known as: blood serum 1-O-(1Z-eicosenyl)-sn-glycero-3-phospho-1D-myo-inositol amount.