The amount of a tyrosine-protein phosphatase non-receptor type 9 (human) when measured in cerebrospinal fluid. The trait is Ontology of Biological Attributes entry OBA_2057857 (level of tyrosine-protein phosphatase non-receptor type 9 (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid tyrosine-protein phosphatase non-receptor type 9 (human) amount.