Quality control solutions are tested on a test strip in the same manner a blood sample would be run. A drop of control solution (instead of a drop of blood) is applied to the strip. In 1-2 minutes, the CardioChek analyzer will display a result. If the result falls within the specified range, the system is working satisfactorily. If not, the test should be repeated or PTS, Inc. Customer Care should be called. It is recommended practice to test controls before testing your blood to ensure best quality results