Can a cna perform CPR on a full code?

Yes a CNA can perform CPR on a full code. A number of things will dictate who will do compressions & who will do breaths. The first on the scene will start CPR. On arrival, usually the RT will do the breaths (bag) and a man (if a woman started CPR) will do (take over) the compressions, especially if it is a large person. Different places may have different protocols on who does what on a code so check where you are working on what the protocols are.