The amount of a BTB/POZ domain-containing protein KCTD4 (human) when measured in cerebrospinal fluid. The trait is level of BTB/POZ domain-containing protein KCTD4 (human) in cerebrospinal fluid (Ontology of Biological Attributes identifier OBA_2080076). Also known as: cerebrospinal fluid BTB/POZ domain-containing protein KCTD4 (human) amount.