In the initial assessment of the situation, you should check the person for signs of life and during rescue breathing, check for signs of life every two minutes. However, unless you see signs of life, do not stop administering CPR. Do not stop unless signs of life are clear and clear.
CPR should not be interrupted. Continue with the procedure until EMS arrives and takes over. Maintain chest compressions. Once you are giving CPR, you should be looking for signs of life as you are transferring from breathing to chest compressions, but you do not stop to check.