The amount of a polypeptide N-acetylgalactosaminyltransferase 16 (human) when measured in cerebrospinal fluid. The trait is level of polypeptide N-acetylgalactosaminyltransferase 16 (human) in cerebrospinal fluid (OBA_2059789, an Ontology of Biological Attributes id). Also known as: cerebrospinal fluid polypeptide N-acetylgalactosaminyltransferase 16 (human) amount.