The amount of a PC4 and SFRS1-interacting protein (human) when measured in cerebrospinal fluid. The trait is level of PC4 and SFRS1-interacting protein (human) in cerebrospinal fluid (OBA_2056362, an Ontology of Biological Attributes term). Also known as: cerebrospinal fluid PC4 and SFRS1-interacting protein (human) amount.