The amount of a protein-glutamine gamma-glutamyltransferase 4 (human) when measured in cerebrospinal fluid. The trait is level of protein-glutamine gamma-glutamyltransferase 4 (human) in cerebrospinal fluid (OBA_2057944). Also known as: cerebrospinal fluid protein-glutamine gamma-glutamyltransferase 4 (human) amount.