The laboratory shall maintain copies of all written, printed and electronic records, including but not limited to bench sheets, raw data, instrument strip charts or printouts, data calculations, and data reports, resulting from the analysis of any PT sample for a minimum of five (5) years. The records shall include a copy of the PT study report forms used by the laboratory to record PT results. All of these laboratory records shall be made readily available during on-site inspections of the laboratory.
Okla. Admin. Code § 252:301-7-10