Proficiency testing provides an independent assessment of laboratory data, compared to reference values or the performance of similar laboratories, providing the organization with confirmation that the technical aspects of its services are satisfactory or alerting to the need for investigation. Potential problems within the laboratory. Participation in these exercises also allows testing performance in new tests or measurements in those that are carried out with little regularity and comparing the results obtained using different methods, different levels of concentration, etc., thus helping to select the methodology that best suits your characteristics and the needs of your clients.
In this sense, only accredited proficiency testing providers offer the maximum service guarantees, since they are the only ones who have demonstrated that they have the necessary technical solvency, complying with the requirements of the international standard UNE-EN ISO/IEC 17043 that establishes the technical competence requirements of this type of entities.