The range they talk about is for people who don't have a problem with their thyroid gland. That's their biggest mistake.
Initially if we start having clinical symptoms and in other countries - along with symptoms being taken into account - if TSH reaches 3+ we will be diagnosed. In the UK for some unfathomable reason we have to wait till it reaches 10. Thereafter with levothyroxine it should be gradually increaed until it is at the bottom of the range, i.e. 1 or lower but many are kept unwell by the professionals' advice that 'they are in normal range'.
Not much fun if the person is symptomatic. The following is an excerpt from an article in doctors' online magazine by Dr Toft who was President of the British Thyroid Association and if you require a copy, email email@example.com to request and to give both a copy.
The fact that we have to do all the searching and uncovering because the Professionals who are supposed to be 'caring' for their patients haven't a clue.
"6 What is the correct dose of thyroxine and is there any rationale for adding in tri-iodothyronine?
The appropriate dose of levothyroxine is that which restores euthyroidism and serum TSH to the lower part of the reference range – 0.2-0.5mU/l.
In this case, free thyroxine is likely to be in the upper part of its reference range or even slightly elevated – 18-22pmol/l. Most patients will feel well in that circumstance.
But some need a higher dose of levothyroxine to suppress serum TSH and then the serum-free T4 concentration will be elevated at around 24-28pmol/l.
This ‘exogenous subclinical hyperthyroidism’ is not dangerous as long as serum T3 is unequivocally normal – that is, serum total around T3 1.7nmol/l (reference range 1.0-2.2nmol/l)."
Let's see if your Endocrinologist and doctor can learn from Dr Toft article.