The amount of a cyclic GMP-AMP phosphodiesterase SMPDL3A (human) when measured in cerebrospinal fluid. The trait is level of cyclic GMP-AMP phosphodiesterase SMPDL3A (human) in cerebrospinal fluid (Ontology of Biological Attributes entry OBA_2080142). Also known as: cerebrospinal fluid cyclic GMP-AMP phosphodiesterase SMPDL3A (human) amount.