The amount of a ethylmalonyl-CoA decarboxylase (human) when measured in cerebrospinal fluid. The trait is level of ethylmalonyl-CoA decarboxylase (human) in cerebrospinal fluid (OBA_2081253, an Ontology of Biological Attributes entry). Also known as: cerebrospinal fluid ethylmalonyl-CoA decarboxylase (human) amount.