The amount of a bis(5'-nucleosyl)-tetraphosphatase [asymmetrical] (human) when measured in cerebrospinal fluid. The trait is OBA_2058018 (level of bis(5'-nucleosyl)-tetraphosphatase [asymmetrical] (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid bis(5'-nucleosyl)-tetraphosphatase [asymmetrical] (human) amount.