The amount of a proprotein convertase subtilisin/kexin type 9 (human) when measured in cerebrospinal fluid. The trait is level of proprotein convertase subtilisin/kexin type 9 (human) in cerebrospinal fluid (OBA_2059888). Also known as: cerebrospinal fluid proprotein convertase subtilisin/kexin type 9 (human) amount.