IV certification question

Hi all. I have a quick question about IV therapy certification course. I plan to take an IV therapy course next month, but I hear different opinions about it. Some said that since you are already an RN, you won't get CE units for the course but will get a form indicate that you are competence for IV and blood draw. I had the same form provided to me by my nursing school couple months before I graduated that said the same thing. Do you guy think that I still need to IV therapy class ? can I use the form that my nursing school gave to me as a proof for IV therapy certification and put that on my resume ? I graduated on Jan 2012. Let me know and thanks in advance for all the help.