The expanded uncertainty, expressed as percentage (MU%, Table 2), for each pesticide was determined in each fortification level for which the assessment of repeatability and reproducibility have been performed. As can be seen in Table 2, the MU calculated for each pesticide showed values below 50%. The uncertainty values at all levels studied were in the range of 11.2%–48.5%. These results were in accordance with the acceptable criteria established in SANCO/12571/2013 document (SANCO, 2013).