This document specifies a common data exchange format (i.e. format of the messages and the dictionary of all the items that compose the message) between the prescribers and the laboratories in the animal health sector. This document is intended for prescribers (purchasers) and service providers in charge of collecting samples and conducting analyses (including analysis laboratories) that want to computerize and standardize their data exchanges, particularly in the animal health sector. This document excludes the code lists that are required for unambiguous data exchange