In quality control, which of the following is NOT included in quality control records?

In quality control, the records typically focus on factors that directly impact the reliability and accuracy of testing procedures and results. The expiration date is crucial for ensuring that reagents and supplies are within their usable time frame, and testing supplies’ precision pertains to how well they perform under specific conditions, both of which are essential for maintaining consistent quality. Similarly, proper use of equipment and materials is critical in ensuring that tests are carried out correctly and that results are valid.

On the other hand, while the cost of equipment may be relevant to an organization’s financial considerations, it does not directly relate to the quality control process itself. Quality control records are concerned with the operational effectiveness and reliability of testing processes rather than financial metrics. Thus, including the cost of equipment is not a focus of quality control records, making it the correct choice for this question.