The amount of a glutathione-specific gamma-glutamylcyclotransferase 2 when measured in blood serum. The trait is Ontology of Biological Attributes identifier OBA_2040999 (level of glutathione-specific gamma-glutamylcyclotransferase 2 in blood serum). Also known as: blood serum glutathione-specific gamma-glutamylcyclotransferase 2 amount.