Why is it important to use controls during testing?

Using controls during testing is crucial because they help verify that the test procedures are functioning correctly. Controls act as a benchmark or reference point against which the results of unknown samples can be compared. When controls yield expected results, it provides confidence that the testing process is reliable and accurate. This is essential in laboratory settings where the accuracy of test results can significantly impact patient care and treatment decisions.

For instance, if a control designed to produce a known outcome fails to do so, it indicates that there may be an issue with the testing process, the reagents used, or the equipment. This allows laboratory personnel to troubleshoot and correct any problems before proceeding with patient samples.

Other options provided do not highlight the fundamental purpose of controls accurately. While ensuring uniformity of test samples may be important, it is not the primary role of controls. Additionally, controls do not inherently increase the sample size of tests nor do they eliminate the necessity for documentation; rather, proper documentation is vital for tracking results and maintaining quality assurance in laboratory processes.