The amount of a tRNA N(3)-cytidine methyltransferase METTL2B (human) when measured in cerebrospinal fluid. The trait is level of tRNA N(3)-cytidine methyltransferase METTL2B (human) in cerebrospinal fluid (Ontology of Biological Attributes identifier OBA_2059328). Also known as: cerebrospinal fluid tRNA N(3)-cytidine methyltransferase METTL2B (human) amount.