The amount of a hypoxanthine-guanine phosphoribosyltransferase (human) when measured in cerebrospinal fluid. The trait is level of hypoxanthine-guanine phosphoribosyltransferase (human) in cerebrospinal fluid (Ontology of Biological Attributes entry OBA_2056592). Also known as: cerebrospinal fluid hypoxanthine-guanine phosphoribosyltransferase (human) amount.