The amount of a isopentenyl-diphosphate Delta-isomerase 2 (human) when measured in cerebrospinal fluid. The trait is level of isopentenyl-diphosphate Delta-isomerase 2 (human) in cerebrospinal fluid (OBA_2080793). Also known as: cerebrospinal fluid isopentenyl-diphosphate Delta-isomerase 2 (human) amount.