So, a 70-year-old relative recently tested positive for thyroid antibodies. But his current tests show he has totally normal thyroid function. This is his first time being tested so we have no idea how long he’s had these antibodies. I’m wondering if maybe they’ve been lurking in his body from a young age but just somehow never got activated? His mother(who lived to be about 98) had hypothyroidism – though she was diagnosed at at time before antibody testing, so no way to know if it was autoimmune or other cause.
I guess I’m curious if Hashimoto’s is like T1D in that there are a lot of people walking around with type 1 diabetes antibodies who never develop T1D, and another large population that basically spends decades progressing from antibody positive to manifesting? Or do these antibodies mean he definitely will develop the disease eventually?