External quality assurance programs provide identical samples to all program participants who then each test the sample using their routine test method. The program collates the results and provides each participant with:
- the range of results achieved
- an indication of whether their method is producing results significantly different to those produced by a different practice using the same method
- details of the accuracy and precision of their results.
If your practice has unacceptable results or performance, you must:
- investigate the reasons for these results or performance
- record any remedial actions taken.