I've been thinking more and more about this but basically I was diagnosed as hypo at 21 (which I'm guessing is quite young?). I've been on 125mcg of levo for years and always just accepted what the doc said and never even questioned the cause of my hypothyroidism.
A couple of years ago I saw a rheumatologist who tested for thyroid antibodies and said it was 'negative'. I've seen an endo for the first time this year and he said that I definitely have hashi's as he said there would be no other reason to be hypothyroid at such a young age. He didn't test my thyroid antibodies as he said that if they came back negative he would still think that I have hashi's and that negative blood results don't mean that I haven't got it.
Basically my question is - is he right? Do I definitely have hashi's if my thyroid antibodies come back as negative? As a bit of added background I have other autoimmune issues - lichen planus and pernicious anemia