I've been treated for hypothyroidism for about 20 years and have never really felt any benefit from the treatment. I am on 75mcg of thyroxine daily and my levels are:
Serum TSH level 0.88 mu/L (0.35 - 5.00mu/L)
Serum free T4 level 18.9 pmol/L (9.00 - 24.00pmol/L)
Serum free T3 level 4.4 pmol/L (3.50 - 6.50pmol/L)
Without boring people with too many details, my friend and I (both the same age) are trying to get fit by cycling which we've been doing since April. She's improved hugely whereas I, although I have improved, am miles behind her in terms of fitness now. I tire very easily and am wondering if my thyroid might be to blame although the comment on the lab report above says the levels are satisfactory?