The amount of a inosine-5'-monophosphate dehydrogenase 1 (human) when measured in cerebrospinal fluid. The trait is OBA_2057366 (level of inosine-5'-monophosphate dehydrogenase 1 (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid inosine-5'-monophosphate dehydrogenase 1 (human) amount.