Performing a control test lets the user know when the meter and test strips are working properly. A control test should be performed when: ​ 

› A new test strip box is opened ​ 

› The test strip container has been left open ​ 

› The test strips are thought to be damaged ​ 

› Checking the meter and test strips ​ 

› The test strips were stored in extreme temperatures, humidity, or both ​ 

› The meter was dropped ​ 

› The test result does not match how the PwD feels ​ 

› Checking to see if the PwD is performing the test correctly