What is the effect of a control value being outside the allowable limits?

When a control value falls outside the allowable limits, it indicates a potential issue with the testing process, instrument calibration, or reagent performance. In laboratory practice, controls are essential for ensuring that tests are functioning correctly and the results are reliable. If a control value fails the acceptable range, it is crucial to maintain quality assurance by repeating the test. This allows the laboratory professional to verify whether the initial result was indeed erroneous or if there was an underlying problem that has since been rectified.

The act of repeating the test helps in confirming the accuracy and reliability of the results. It ensures that clinicians are provided with dependable information for patient diagnosis and treatment. This practice of retesting helps protect patient safety and enhances the overall integrity of laboratory operations.