The amount of a phosphatidylinositol 3,4,5-trisphosphate 5-phosphatase 1 (human) when measured in cerebrospinal fluid. The trait is level of phosphatidylinositol 3,4,5-trisphosphate 5-phosphatase 1 (human) in cerebrospinal fluid (OBA_2080195). Also known as: cerebrospinal fluid phosphatidylinositol 3,4,5-trisphosphate 5-phosphatase 1 (human) amount.