CheMa Laboratories, in the context of applying ISO 17025:2017, follows the following decision rule to decide on the compliance of samples with the applicable legislation or specifications as the case may be:

As long as the national or EU legislation or EU guidelines decision rules are established, they are strictly followed (including cases where tolerances are established).
In cases where no rules are established by legislation or guidelines, when evaluating a result by CheMa Laboratories, which is judged based on a maximum or minimum limit, the decision rule below will be taken into account, in order to examine the compliance of a sample with the provisions of the applicable legislation:
For a 95% confidence level,
x-1.645u<Lmax, where x the measured result, u the standard uncertainty and Lmax the upper (legislative) limit (compliant result) x-1.645u>Lmax, where x the measured result, u the standard uncertainty, and Lmax the upper (legislative) limit (non-compliant result)
x+1.645u>Lmin, where x is the measured result, u is the standard uncertainty and Lmin is the lower (legislative) limit (compliant result)
x+1.645u<Lmin, where x is the measured result, u is the standard uncertainty and Lmin is the lower (legislative) limit (non-compliant result)

• In the event that the measured result x is compared to a single declared value L, this is considered compliant at a 95% confidence level, when x-2u<L<x+2u where u is the standard uncertainty.