The amount of a BTB/POZ domain-containing protein KCTD1 (human) when measured in cerebrospinal fluid. The trait is level of BTB/POZ domain-containing protein KCTD1 (human) in cerebrospinal fluid (OBA_2059469, an Ontology of Biological Attributes id). Also known as: cerebrospinal fluid BTB/POZ domain-containing protein KCTD1 (human) amount.