hello I'm on 100 of thyroxine a day and have these results should I stay on this dose or add and extra 25 a day to bring my t3 up ? thanks


Thyroid Function


FREE THYROXINE 21.6 pmol/l 12.0 - 22.0

FREE T3 5.1 pmol/L 3.1 - 6.8

Last edited by

8 Replies

  • How are you feeling? :) It's not all about the blood tests. xx

  • still a bit tired constantly ,thanks

  • Did you end up raising it last time? healthunlocked.com/thyroidu...

  • no i stayed at 100 to make sure id given it enough time although my prescription is for 125

  • because my free t4 is 21.6 i wasn't sure if that was to high

  • According to Dr Toft:

    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).

    Even while taking the slightly higher dose of levothyroxine a handful of patients continue to complain that a sense of wellbeing has not been restored.

    A trial of levothyroxine and tri-iodothyronine is not unreasonable. The dose of levothyroxine should be reduced by 50µg daily and tri iodothyronine in a dose of 10µg (half a tablet) daily added.

  • So FT4 & FT3 are both up on last time and you have a prescription of 125. Was just wondering whether alternate dosing might be a good idea. x

  • that's probably a god idea just so its not that much of a raise x

You may also like...