A switch for a conveying line for transporting a laboratory diagnostic vessel carrier is presented. The conveying line comprises a first line portion and a second line portion. The switch comprises a curved first guiding surface and a second guiding surface. The switch is moveable between a first position, in which the laboratory diagnostic vessel carrier is transportable along the curved first guiding surface from the first line portion to the second line portion, and a second position, in which the laboratory diagnostic vessel carrier is further transportable along the second guiding surface on the first line portion. A switch assembly and a conveying line are also disclosed.