The amount of a mothers against decapentaplegic homolog 1 (human) when measured in cerebrospinal fluid. The trait is level of mothers against decapentaplegic homolog 1 (human) in cerebrospinal fluid (OBA_2058952, an Ontology of Biological Attributes entry). Also known as: cerebrospinal fluid mothers against decapentaplegic homolog 1 (human) amount.