This is a tough one. The states have a number of regulations and methodologies that other countries don’t so I imagine this is the barrier that you are seeing. This is especially true for immunohematology.
if you are already here in the states, I would suggest finding a MLT or MLS clinical rotational program that you can just go to if you already have the degree and necessary prerequisites, but need the experience. These are sometimes through hospitals or through the school themselves. It is usually only 9 months to a year program and can be a great bridge to employment with that hospital you rotate in.
if you are not in the states, I would seek out one of the contact companies like MedPro. They are used throughout the states. This is a great way to get that background in regulation and introduction to hospitals that will hire from foreign locations.
good luck!