Abstract: An apparatus for preparation of samples for analysis comprising includes structure (21) for interchangeably locating first racks of sample receptacles that contain samples to be prepared for analysis and second racks include racks of different configuration racks for of sample receptacles which second that are respectively transferable to different analysis instruments, and for receiving and positioning a plurality of reagent vessels at known respective positions. An assembly of devices (50,60) is actuable to transfer samples from sample receptacles of the first rack to sample receptacles of the second rack, while carrying out a sample preparation operation selected from a plurality of pre-programmed sample preparation operations, wherein the apparatus is configured to identify which of said the second racks of different configuration is located at said the structure, and to adapt said the transfer and said the selected sample preparation operation to suit the identified rack.