The amount of a phosphoenolpyruvate carboxykinase [GTP], mitochondrial (human) when measured in cerebrospinal fluid. The trait is level of phosphoenolpyruvate carboxykinase [GTP], mitochondrial (human) in cerebrospinal fluid (OBA_2059033). Also known as: cerebrospinal fluid phosphoenolpyruvate carboxykinase [GTP], mitochondrial (human) amount.