I'm somewhat active over on the pernicious anemia forums but have a question over here pertaining to TSH. For years before being diagnosed with pernicious anemia and still now I have had symptoms of hypothyroidism. I had numerous labs done (thyroid panel) but my tsh was always is 3.0-3.9range in the past. I was told I was borderline back in those days. In March 2016 my GP tested again and I got a tsh of 8.280. My t3 reverse was 22, thyroid peroxidase antibody (anti TPO) was 4, anti thyroglobulin was <1, free triiodothyronine 3.59, and thyroxine free 1.07. I was told at that point I had hypothyroidism and was offered synthroid but politely declined as she said treating it wasn't necessary since everything else besides tsh was fine. Fast forward May 2016 and my tsh was down to 4.080, thyroxine free 1.09, triiodothyronine 2.98, again no treatment, it had come down to that level on its own. I had labs done last week tsh 2.510, t4 1.27, triiodothyronine 3.5. I'm not really sure what to make of these results. My tsh is normal and so is everything else pertaining to thyroid. As for other health problems I do have pernicious anemia with atrophic gastrtis and a pending neuroendocrine cancer diagnosis because of excessively high gastrin levels and tumor marker chromogranin a.
Does anyone know why my tsh would have been elevated for a few months? Would that still be considered hypothyroidism? Do GPs base hypothyroidism off of labs, symptoms or both? Can any other conditions (besides thyroid disease) elevate tsh levels?
Sorry this was so long. Thanks in advance!