You must consider the coordination. Most donations are done pretty quickly in a hospital while the body is still ventilated and blood is circulated by machine.
Instead, we registered at Mayo. Here's how that happened:
Within the hour of my PALS death at home, I called the Mayo and the funeral home. The funeral home picked up the body, coordinated with Mayo, who took the brain and brain stem. I'm not sure if any other donations could be made so late (hours) after death.