The amount of a Rho-related GTP-binding protein RhoB (human) when measured in cerebrospinal fluid. The trait is level of Rho-related GTP-binding protein RhoB (human) in cerebrospinal fluid (Ontology of Biological Attributes entry OBA_2058317). Also known as: cerebrospinal fluid Rho-related GTP-binding protein RhoB (human) amount.