The amount of a N(6)-adenosine-methyltransferase catalytic subunit METTL3 (human) when measured in cerebrospinal fluid. The trait is Ontology of Biological Attributes term OBA_2059566 (level of N(6)-adenosine-methyltransferase catalytic subunit METTL3 (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid N(6)-adenosine-methyltransferase catalytic subunit METTL3 (human) amount.