The number of A2LA ACCREDITED LABORATORIES in each field is summarized in Figure 2. Details about tests, types of tests, or calibrations included in a laboratory's accreditation are identified in a Scope of Accreditation and can be obtained by contacting A2LA.

A laboratory may be competent to perform tests, types of tests, or calibrations other than those listed on its scope or may not perform the tests or calibrations exactly as written for some customers. The laboratory and its customer must agree on the method to be used. If a laboratory presents data on a test report or calibration certificate carrying an A2LA Logo, however, that data must be as a result of using a method identified in the scope as stated.