Only four states in the US, including Washington, California, Nevada, and Louisiana, require certification as well as licensing for phlebotomists.
The rest of the nation hires phlebotomists without documentation of training, but there are other requirements.
For instance, in Alabama, phlebotomists must have proof of training, which can be a certificate or degree.
If a phlebotomist receives training and certification and moves to a new state of residence, they will most likely need to register or certify with that state to get hired in the new state.