# Commission Decision of 12 August 2002 implementing Council Directive 96/23/EC concerning the performance of analytical methods and the interpretation of results (notified under document number C(2002) 3044) (Text with EEA relevance) (2002/657/EC), Division 3.1.2.3: Within-laboratory reproducibility

Extent: E+W+S+N.I.

Prepare a set of samples of specified test material (identical or different matrices), fortified with the analyte(s) to yield concentrations equivalent to 1, 1,5 and 2 times the minimum required performance limit or 0,5, 1 and 1,5 times the permitted limit.
At each level the analysis should be performed with at least six replicates.
Repeat these steps on at least two other occasions with different operators and different environmental conditions, e.g. different batches of reagents, solvents etc., different room temperatures, different instruments, etc. if possible.
Analyse the samples.
Calculate the concentration detected in each sample.
Find the mean concentration, standard deviation and the coefficient of variation ( %) of the fortified samples.

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Source: https://www.legislation.gov.uk/eudn/2002/657/annex/chapter/3.1/division/3.1.2.3 (the official version)
Page: https://openlegislation.uk/eu-decision-2002-657/annex/chapter-3.1/division-3.1.2.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.