What value of uncertainty do the PRC laboratories apply to the measured results?
The analytical quality control guidance advises that a default value of 50% may be applied to the results. This value will provide 95% probability that the measured value is above the MRL. PRC laboratories apply the 50% default value to all results, unless there are particular safety reasons why a more accurate value should be used. If that is considered necessary, it will be explained fully when the results are published.
