I have been tested for TPO Antibodies twice before that, all good. And for the sake of it, I still requested it again and this is what came out of it:
Anti Thyroid Peroxidase <28 kU/l (range = 60) so, this means it should not exceed 60.
It's exactly the same as before. JT even said not to test for TPO Antibodies anymore, since it was good twice already, but for the sake of it I did it one more time again.