The amount of a GDP-fucose protein O-fucosyltransferase 1 (human) when measured in cerebrospinal fluid. The trait is level of GDP-fucose protein O-fucosyltransferase 1 (human) in cerebrospinal fluid (OBA_2080973). Also known as: cerebrospinal fluid GDP-fucose protein O-fucosyltransferase 1 (human) amount.