The amount of a tryptophan 2,3-dioxygenase (human) when measured in cerebrospinal fluid. The trait is level of tryptophan 2,3-dioxygenase (human) in cerebrospinal fluid (OBA_2057938, an Ontology of Biological Attributes entry). Also known as: cerebrospinal fluid tryptophan 2,3-dioxygenase (human) amount.