The amount of a platelet-activating factor acetylhydrolase IB subunit alpha1 (human) when measured in cerebrospinal fluid. The trait is level of platelet-activating factor acetylhydrolase IB subunit alpha1 (human) in cerebrospinal fluid (Ontology of Biological Attributes id OBA_2058879). Also known as: cerebrospinal fluid platelet-activating factor acetylhydrolase IB subunit alpha1 (human) amount.