Provided is a monoclonal antibody, or antigen-binding fragment thereof, that binds to c-Met. Such antibodies, or antigen-binding fragments thereof, are useful in in vivo, ex vivo or in vitro immunochemical and other imaging methods for detecting cell surface c-Met receptor levels for diagnostic, prognostic and predictive purposes, and for optimizing therapeutic regimens in patients harboring tumors in which c-Met is implicated in pathogenesis.
