Accu Chek Aviva Blood Control Solution. Take a bottle of control solution and hold the dropper tip downwards until a hanging drop forms at its end. Gently touch the drop of control solution against the front edge of the test strip near the black notch until the meter beeps and appears in the display. The meter runs a test, then displays the result and CTRL.Refer to the table on the label of the vial the drum came in and determine if the value is within the expected range. If the result is outside this range, run another quality control check. If the result of the second test is outside the expected range as well, refer to the Troubleshooting guide in Chapter 10 of User Manual.