Im am a licensed Cna and I just finished my phlebotomy class and im going to become a registered phlebotomist in two weeks. If your going to go back to school like I am you will find the physical labor of being a Cna very tiring mixed with school it can be done but it is extremely challenging. Phlebotomy jobs are harder to find than Cna jobs but they usually pay more and there is no physical labor involved. Two is always better than one because you have options, there are also alot of jobs that would utilize both. Care Partners at Sentara utilize both and doctor offices will utilize you as a medical assistant.