A container carrier for carrying a sample container along a track is presented. The container carrier comprises a holding portion for receiving and holding a sample container and a base portion. A radio frequency identification (RFID) tag containing identifying information is provided with an antenna for wireless communication of the RFID tag with a reader device of the diagnostics system to read the identifying information. The RFID tag is on the holding portion. An arrangement for a diagnostics system is provided comprising container carriers and a track with a transport mechanism for moving the container carriers along a transportation lane. The transport mechanism defines a transport plane along which the container carriers move. A reader device reads the identifying information from the RFID tags. The reader device comprising a reader antenna above the transport plane to generate and emit a reader field for wireless communication with the RFID tag's antenna.