The duties of a PCT and a Certified Nursing Assistant (CNA) is somewhat similar. Both of them are capable of feeding, cleaning, and transferring patients as well as monitoring their vital signs. A PCT can administer basic treatments, whereas a CNA can only provide basic care while working under the direction of a registered nurse or doctor (such as taking phone calls and recording food and drink intake). A PCT, for instance, could be able to do blood-drawing techniques and EKG readings that a CNA cannot. Remember that each function's level of responsibility is governed by the laws of the specific state.