The amount of a Na(+)/H(+) exchange regulatory cofactor NHE-RF3 (human) when measured in cerebrospinal fluid. The trait is level of Na(+)/H(+) exchange regulatory cofactor NHE-RF3 (human) in cerebrospinal fluid (OBA_2059192). Also known as: cerebrospinal fluid Na(+)/H(+) exchange regulatory cofactor NHE-RF3 (human) amount.