If a person is choking when should you do before using CPR?

If a person is choking, you should first perform the Heimlich maneuver or back blows to try to dislodge the obstruction. If the person becomes unresponsive and cannot breathe, call for emergency help immediately. Then, begin CPR, starting with chest compressions, and check the mouth for any visible obstruction before giving rescue breaths. Always prioritize addressing the choking issue before proceeding with CPR.