Quality control records pertaining, but not limited to the following areas, shall be retained by the laboratory for at least the 3 most recent years:
Prepared solution standardizations;
Recovery studies by known analyte additions;
The purity checks of reagents and test materials;
Apparatus and equipment calibrations;
The quality examination and testing of materials;
The mandatory participation in proficiency check sample testing or collaborative studies;
Daily critical parameter checks of equipment, such as temperature readings;
The equivalency tests of new procedures with standard methodologies.
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