The amount of a histone-lysine N-methyltransferase ASH1L (human) when measured in cerebrospinal fluid. The trait is level of histone-lysine N-methyltransferase ASH1L (human) in cerebrospinal fluid (Ontology of Biological Attributes entry OBA_2081198). Also known as: cerebrospinal fluid histone-lysine N-methyltransferase ASH1L (human) amount.