When you have thyroid
) you have no thyroid gland. And you must have some thyroid hormone secreted to maintain proper health. So Doctors do a blood test
after surgery/radiation), and usually they put you on some kind of replacement. IE levothyroxin. This you must be on for the rest of your life.
If I were you I would just go on thyroxin for life. I mean why have the operation if you are going to have to take the medication anyway.