Final answer:
The task of comparing a patient's previous test results to their current ones is a part of quality control in medical laboratories, which ensures consistency and reliability of laboratory outcomes.
Step-by-step explanation:
The request for comparison of Mr. Smith's previous laboratory results to today's results is an example of quality control in a medical laboratory setting. Quality control in this context refers to the process of ensuring that laboratory results are consistent and reliable over time. By comparing current results with previous ones, the medical laboratory technologist can verify that the laboratory tests are producing accurate and stable outcomes. This comparison helps in validating the test procedures and ensuring that any diagnosed conditions or progress can be accurately monitored.