The amount of a tumor necrosis factor ligand superfamily member 11 (human) when measured in cerebrospinal fluid. The trait is level of tumor necrosis factor ligand superfamily member 11 (human) in cerebrospinal fluid (Ontology of Biological Attributes term OBA_2056010). Also known as: cerebrospinal fluid tumor necrosis factor ligand superfamily member 11 (human) amount.