My personal experience i started taking 25mcg when I had a TSH of 5.1 (0.3-4.2) on the 13th of February 2020 and on the 13th of April 2020 my TSH only dropped to 3.8, as Geeling said post test results for some better answers and opinions, there's a wealth of knowledge here on this forum that helped me out a lot so I'm sure they can help you too.
Was the TSH 20.6 result from October before you started on Levo ? If you'd been on a decent dose since then then it would probably have come down quite a lot by now .... however , since they only gave you 25mcg , i don't know how much it will have fallen in your case.
In my case i only had TSH of 6.8, at diagnosis, and after 6 weeks on 50mcg it had fallen to 2.9
....but everyone will have a different response.
I would hope that whatever your TSH turns out to be on mondays test, there would still be enough time for it to fall to something that anaesthetist is happy with before the 9th January, but i would think the chances are much less if they don't increase your Levo dose .
If you still get nowhere with the GP, i'd ask the anaesthetist to have a word with them once they see you latest results... it would be such a shame to miss the operation slot because the GP hadn't put you on a decent dose.
Try not to worry , TSH can move quite a lot within a few days. mine once went up from 0.05 to 7.89 within 14 days when i stopped Levo completely.
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