The amount of a serine/threonine-protein kinase OSR1 (human) when measured in cerebrospinal fluid. The trait is level of serine/threonine-protein kinase OSR1 (human) in cerebrospinal fluid (Ontology of Biological Attributes identifier OBA_2056536). Also known as: cerebrospinal fluid serine/threonine-protein kinase OSR1 (human) amount.