Doctors wrongly believe that anywhere in the 'normal' range means we are fine. He is wrong. The normal range is usually for diagnosing people who have hypothyrodism and due to the BTA's guidelines that we've to remain undiagnosed until the TSH is 10 (no other country does) Once diagnosed we should have sufficient levothyroxine to bring our TSH to 1 or lower and FT4 and FT3 towards the top of the range. Rarely is FT4 and FT3 tested and it puzzles me as the FT4 and FT3 (especially 3) gives more information on the state of the patient's health than the TSH. This is from TYK:-
Unfortunately, I am not medically qualified but this is an excerpt which explains better. Antibodies attack the thyroid gland and they wax and wane - so sometimes there's to many and at other times low:-
Featured: Thyroid Peroxidase Test Main Article
The thyroid peroxidase test measures the level of an antibody that is directed against thyroid peroxidase (TPO). A presence of TPOAb in the blood reflects a prior attack by the body's immune system on thyroid tissue. A positive thyroid peroxidase test may signal chronic thyroiditis. Other autoimmune disorders, however, may have a positive TPOAb test.
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