The amount of a BTB/POZ domain-containing protein KCTD5 (human) when measured in cerebrospinal fluid. The trait is level of BTB/POZ domain-containing protein KCTD5 (human) in cerebrospinal fluid (OBA_2081319, an Ontology of Biological Attributes identifier). Also known as: cerebrospinal fluid BTB/POZ domain-containing protein KCTD5 (human) amount.