90.103—Maintenance of quality control records.
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:
(a)
Prepared solution standardizations;
(b)
Recovery studies by known analyte additions;
(c)
The purity checks of reagents and test materials;
(d)
Apparatus and equipment calibrations;
(e)
The quality examination and testing of materials;
(f)
The mandatory participation in proficiency check sample testing or collaborative studies;
(g)
Daily critical parameter checks of equipment, such as temperature readings;
(h)
The equivalency tests of new procedures with standard methodologies.