Contemplating relocating from Atlanta, GA to Seattle

I am trying to decide on whether or not I am going to move to Seattle. I am currently certified as a CNA/Patient Care Tech in a hospital and would like to know what steps I need to anticipate completing to get certified in Washington State. Do I need to take a complete CNA class or can I just take the certification exam(s). If a class is necessary, is there a refresher class I can consider as opposed to taking the entire course all over again?

Any and all input would be greatly appreciated.
Thank You !