This technical specification is an official statement of the European Society of Gastrointestinal Endoscopy (ESGE) and the European Society of Gastroenterology and Endoscopy Nurses and Associates (ESGENA). It addresses validation and routine testing of automated reprocessing procedures in washer-disinfectors for thermolabile endoscopes, complying with the final version of EN ISO 15883, parts 1, 4, and ISO/TS 15883 - 5.