The amount of a aldo-keto reductase family 1 member C4 (human) when measured in cerebrospinal fluid. The trait is level of aldo-keto reductase family 1 member C4 (human) in cerebrospinal fluid (OBA_2057254, an Ontology of Biological Attributes term). Also known as: cerebrospinal fluid aldo-keto reductase family 1 member C4 (human) amount.