I've been hypothyroid for 10 years and take 100 micrograms of Levothyroxine per day. However, like so many others on this site, I still continue to experience symptoms of an under-active thyroid. After recent research I wanted to check my T3 levels, since my GP refused to give me the test, I paid for a Medicheck home test. I have just received my results:
TSH: 2.24 mIU/L (0.27 - 4.20 )
FREE THYROXINE: 17.4 pmol/L (12.00 - 22.00)
TOTAL THYROXINE(T4): 124.0 nmol/L (59.00 - 154.00)
FREE T3: 4.42 pmol/L (3.10 - 6.80)
THYROGLOBULIN ANTIBODY: <10 IU/mL (0.00 - 115.00)
THYROID PEROXIDASE ANTIBODIES: <9.0 IU/mL (0.00 - 34.00)
The doctor's comments were:
"Your thyroid stimulating hormone is in the upper half of the normal range. Some people who are taking thyroxine feel better when their thyroid stimulating hormone is maintained in the lower half of the normal range. If you are experiencing symptoms of an underactive thyroid (tiredness, weight gain, mood problems, hair/skin problems) then I recommend that you discuss this result further with your GP. Your T3 and thyroxine are within normal limits.
Your antibody levels are within normal limits and so an autoimmune condition of the thyroid is not detected."
So it looks like my T3 and T4 are ok. But the part which really surprised me was that the doctor says my condition is not autoimmune. None of my GPs have ever told me what sort of hypothyroidism I have, as far as I know, my antibodies have never been tested before. However, I always presumed that I had Hashimoto's since this is the most common form, there is a family history of hypothyroidism, I have no other medical conditions and I lead a healthy lifestyle.
If I don't have Hashimoto's then what is causing my hypothyroidism? I'm worried that there could be an underlying cause which hasn't been addressed for 10 years, or perhaps I've just had genetic bad luck.
Thanks in advance!