The amount of a tumor necrosis factor ligand superfamily member 4 (human) when measured in cerebrospinal fluid. The trait is Ontology of Biological Attributes identifier OBA_2057451 (level of tumor necrosis factor ligand superfamily member 4 (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid tumor necrosis factor ligand superfamily member 4 (human) amount.