Simply stated, measurement uncertainty cannot be ignored when it comes to conformity statements reported under accreditation. During contract review a laboratory must confirm with the customer that it can meet the requirements for accuracy and are able to perform the measurements. The issue of Measurement uncertainty must be discussed and evaluated to avoid the risk of false pass (acceptance), as the uncertainty could result in the measurement reported being larger than the specification, due to the uncertainty component,
If the expanded measurement uncertainty is smaller than the accuracy requirements of the regulators or client, then the agreed decision rule could, for example, be: “PASS” indicates that the test method conforms with the accuracy requirements of the testing standard. The expanded measurement uncertainty (k = 2 ,95 % probability) is not greater than the accuracy requirements defined as <value>. You could also refer to a table.