The amount of a endoplasmic reticulum aminopeptidase 1 (human) when measured in cerebrospinal fluid. The trait is Ontology of Biological Attributes term OBA_2081338 (level of endoplasmic reticulum aminopeptidase 1 (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid endoplasmic reticulum aminopeptidase 1 (human) amount.