I can tell you of my experience. Being positive for thyroid peroxidase meant that I had autoimmune thyroid disease. That means the thyroid tissue changes in some way so that your body no longer recognizes the tissue as its own, and your immune system begins to attack your thryoid-- usually making it dysfunctional at some point. My doctor told me that he would prescribe thyroid hormone to reduce inflammation of the thyroid and restore thyroid balance. As it turned out, I had more problems than this, but I hope I have given you some explanation of this disease.
I sent an IM, but if anyone else wants to jump in...
WELCOME to the THYROID COMMUNITY!
Anybody jump in .. I don't have the knowledge in the area of your ? but wanted to say hello.
Cheryl