The amount of a lysosomal cobalamin transporter ABCD4 (human) when measured in cerebrospinal fluid. The trait is Ontology of Biological Attributes identifier OBA_2055995 (level of lysosomal cobalamin transporter ABCD4 (human) in cerebrospinal fluid). Also known as: cerebrospinal fluid lysosomal cobalamin transporter ABCD4 (human) amount.