The amount of a phosphatidylinositol 3-kinase catalytic subunit type 3 (human) when measured in cerebrospinal fluid. The trait is level of phosphatidylinositol 3-kinase catalytic subunit type 3 (human) in cerebrospinal fluid (OBA_2059913). Also known as: cerebrospinal fluid phosphatidylinositol 3-kinase catalytic subunit type 3 (human) amount.