A sample vessel rack (1), which comprises a frame (2) with a plurality of openings (3) in the upper surface of the frame for sample vessels (9), and a locking plate member (5) movable in a plane parallel to the upper surface of the frame (2) of the rack from a releasing position to a locking position and back, wherein the removal of the sample vessels (9) from the rack is prevented when the locking plate member is in the locking position, the openings (3) of the upper surface of the frame (2) comprises slots (12) formed on their side, and in the locking position a part of the locking plate member (5) sets itself in the area of the slots. The invention also relates to such a method and a sample vessel rack system.
