Background Historically, the accreditation of laboratories was generally based on a fixed scope which should clearly and unambiguously define the tests covered by the laboratory’s accreditation ( e.g. immunofluorescence test for the detection of Ralstonia solanacearum on potato tubers). However, this does not readily allow new or modified tests to be added to a laboratory’s scope, even when the competence of the laboratory in performing and validating related tests has already been evaluated by an accreditation body. Although applications for an extension to scope can be made at any time, the timescales involved may prevent rapid responses to client requests. Consequently, the concept of flexible scope has been developed. A flexible scope of accreditation allows a laboratory to undertake certain tests, and to report the results as accredited, even though these tests are not explicitly stated in the laboratory’s scope. [.] ; http://euroreference.mag.anses.fr/en