The amount of a ectonucleoside triphosphate diphosphohydrolase 1 (human) when measured in cerebrospinal fluid. The trait is level of ectonucleoside triphosphate diphosphohydrolase 1 (human) in cerebrospinal fluid (OBA_2057994). Also known as: cerebrospinal fluid ectonucleoside triphosphate diphosphohydrolase 1 (human) amount.