Final answer:
The appropriate course of action when the controls for a run of cholesterol tests are not within the 2 SD confidence range is to investigate and address the issue.
Step-by-step explanation:
When the controls for a run of cholesterol tests are not within the 2 SD confidence range, the appropriate course of action is to investigate and address the issue. This could involve checking the accuracy of the controls, recalibrating the equipment, or repeating the test to ensure accurate results. It is important to identify and rectify any issues to ensure the reliability and validity of the test results.