Control solution tests should be performed when:nn1. First receiving or purchasing the meter.nn2. Checking the meter and test strips (which should be done at least once a week).nn3. Using a new vial of test strips. nn4. You suspect the meter or test strips are not working properly. nn5. Your blood glucose test results are not consistent with your expectation, or you think the results are not accurate. nn6. Practicing the testing process. nn7. The meter has been dropped or damaged.