The amount of a receptor-interacting serine/threonine-protein kinase 2 (human) when measured in cerebrospinal fluid. The trait is level of receptor-interacting serine/threonine-protein kinase 2 (human) in cerebrospinal fluid (OBA_2056143, an Ontology of Biological Attributes identifier). Also known as: cerebrospinal fluid receptor-interacting serine/threonine-protein kinase 2 (human) amount.