The amount of a NADH-cytochrome b5 reductase 3 (human) when measured in cerebrospinal fluid. The trait is level of NADH-cytochrome b5 reductase 3 (human) in cerebrospinal fluid (OBA_2056585, an Ontology of Biological Attributes term). Also known as: cerebrospinal fluid NADH-cytochrome b5 reductase 3 (human) amount.