The amount of a phosphoinositide-3-kinase-interacting protein 1 (human) when measured in cerebrospinal fluid. The trait is level of phosphoinositide-3-kinase-interacting protein 1 (human) in cerebrospinal fluid (OBA_2080381, an Ontology of Biological Attributes term). Also known as: cerebrospinal fluid phosphoinositide-3-kinase-interacting protein 1 (human) amount.