If the person becomes unconscious, perform standard cardiopulmonary resuscitation (CPR) with chest compressions and rescue breaths. If another person is available, have that person call for help while you perform first aid. If you're the only rescuer, perform back blows and abdominal thrusts before calling 911 or your local emergency number for help.

Perform between six and 10 abdominal thrusts until the blockage is dislodged.

Press hard into the abdomen with a quick, upward thrust - as if trying to lift the person up. Position it slightly above the person's navel. If a child is choking, kneel down behind the child. Place one foot slightly in front of the other for balance. To perform abdominal thrusts (Heimlich maneuver) on someone else: It's OK not to use back blows if you haven't learned the technique. The American Heart Association doesn't teach the back blow technique, only the abdominal thrust procedures.

Alternate between 5 blows and 5 thrusts until the blockage is dislodged.

Perform five abdominal thrusts (also known as the Heimlich maneuver).

Deliver five separate back blows between the person's shoulder blades with the heel of your hand. Bend the person over at the waist so that the upper body is parallel with the ground. Place one arm across the person's chest for support. Stand to the side and just behind a choking adult. If the person is choking and can't talk, cry or laugh forcefully, the American Red Cross recommends a 'five-and-five' approach to delivering first aid: If the person is able to cough forcefully, the person should keep coughing.

Skin that is flushed, then turns pale or bluish in color.

Skin, lips and nails turning blue or dusky.

Cough, which may either be weak or forceful.

Difficulty breathing or noisy breathing.If the person doesn't give the signal, look for these indications: The universal sign for choking is hands clutched to the throat.

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