The amount of a phosphatidylinositol polyphosphate 5-phosphatase type IV (human) when measured in cerebrospinal fluid. The trait is OBA_2081218 (level of phosphatidylinositol polyphosphate 5-phosphatase type IV (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid phosphatidylinositol polyphosphate 5-phosphatase type IV (human) amount.