The amount of a endoplasmic reticulum mannosyl-oligosaccharide 1,2-alpha-mannosidase (human) when measured in cerebrospinal fluid. The trait is level of endoplasmic reticulum mannosyl-oligosaccharide 1,2-alpha-mannosidase (human) in cerebrospinal fluid (OBA_2081593, an Ontology of Biological Attributes id). Also known as: cerebrospinal fluid endoplasmic reticulum mannosyl-oligosaccharide 1,2-alpha-mannosidase (human) amount.