Performing a control test lets the user know the meter and test strips are working properly. Perform a control test when:

•  You open a new test strip box
•  You left the test strip container open
•  You think the test strips are damaged
•  You want to check the meter and test strips
•  The test strips were stored in extreme temperatures, humidity, or both
•  You dropped the meter
•  Your test result does not match how you feel
•  You want to check if you are performing the test correctly