When should liquid controls be used with i-STAT cartridges?

Using liquid controls with i-STAT cartridges is crucial for ensuring accurate and reliable test results. Liquid controls are standardized solutions that contain known concentrations of the analytes being tested. They help verify that the i-STAT system is functioning correctly and that the testing process can yield valid results.

The correct answer highlights the importance of performing quality control each time a new batch of i-STAT cartridges is opened. This practice ensures that every new batch's performance characteristics, such as precision and accuracy, are verified before patient testing begins. By using liquid controls at this point, healthcare professionals can confirm that the new cartridges are working as expected and adhere to quality standards.

Employing liquid controls every day, while a good practice for certain quality assurance protocols, may not be necessary if it is ensured that each new batch has been validated upon opening. Using controls only during recalibration or when errors are suspected does not provide the comprehensive assurance needed for patient testing. Testing new batches of cartridges with liquid controls establishes a baseline of reliability from the outset.