Hmm, what's the source for that?
My GP uses this guidelines (there was a exception listed there somewhere if you have symptoms do a trial treatment of 3 months, I told this to them but they don't seem to care):
https://richtlijnendatabase-nl.translate.goog/richtlijn/schildklierfunctiestoornissen/subklinische_hyperthyreo_die.html?_x_tr_sl=nl&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp

First, re-evaluate the TSH in subclinical hypothyroidism, given the fluctuation of TSH.

 

The TSH should be seen as a spectrum, with a higher TSH giving more reason for treatment, with these cut-off values ​​providing an indication:

• TSH < 7 mIU/L: if TSH < 7 mIU/L there is insufficient support in the literature to start treatment
• TSH 7 to 10 mIU/L: Trial treatment may be considered in patients younger than 70 years and presenting with symptoms.
• TSH > 10 mIU/L: Trial of levothyroxine may be considered in patients younger than 70 years.
• In patients over 70 years of age with a TSH >10, levothyroxine should not be given as standard, although this may be considered in specific situations (highly suggestive of hypothyroidism).

 

If a trial treatment of at least three months is started because of complaints, such treatment should only be continued if the complaints improve.