Abstract
When required to provide a statement of conformity, the laboratory shall agree with its customer on the specification and decision rule to be applied. Employing a decision rule on how to take into account measurement uncertainty carries the risk of providing an incorrect decision. To reduce this risk, the mechanism of guard banding is introduced. This technical note covers the approach presented in ILAC G8 and other relevant literature. In some cases, e.g. when assessing conformity with regulatory requirements, measurement uncertainty is taken into account indirectly. When providing statements of conformity, laboratories usually consider the risk related to a particular test item. Providing the statement of conformity is also covered by the ISO/IEC 17025 standard for the competence of laboratories.
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