I would be grateful for advice and/or comments please: my daughter, who is 32, was diagnosed with an under active thyroid about 5 years ago, and has been on 50mcg of thyroxine since then. She is still very very tired, with flu like aches and pains, and so I encouraged her to have blood tests done privately. Within the thyroid section the results are Free T4. 17.09. (Range 12-22). Free T3. 4.44. (Range. 3.1-6.8). TSH 1.01. (Range 0.27-4.20). Anti-Thyroidperoxidase antibodies 540.1. (Range <34). Clearly I am concerned about the last result, and wonder what your thoughts might be about it? Many thanks.