A method for determining at least one state of at least one cavity of a transport interface configured for transporting sample tubes is provided and comprises: capturing at least one image of at least a part of the transport interface by using at least one camera; categorizing the state of the cavity into at least one category by applying at least one trained model on the image by using at least one processing unit, wherein the trained model is being trained on image data of the transport interface, wherein the image data comprises a plurality of images of the transport interface with cavities in different states; and providing the determined category of at least one cavity via at least one communication interface.