High T3 and Low T4

I have been self treating with Armour Thyroid for about 6 weeks now and my TSH level has come down from 3.31 to 1.97 but my T3 is now high at 5.7 range 3.5-5.6 and my T4 has now gone down to 9.0 range 7.5-21.1 and was 11.9 back in March.

Bloods were taken at 8am and I did not take my afternoon dose the day before.

I was feeling great but in the last couple of weeks I have been very sleepy again.

Question is should I continue with Armour or maybe add some Levo or even t4 only?

Many thanks to you lovely people who are able to help and offer advice.

4 Replies

  • Kellyjam1,

    FT4 often drops, sometimes even below range, when taking NDT or T4+T3. FT3 is very mildly over range but TSH remains quite high so I would continue on your current dose and retest in 6 weeks. If FT3 remains over range you can reduce dose by 1/4 grain (15mg).


    I am not a medical professional and this information is not intended to be a substitute for medical guidance from your own doctor. Please check with your personal physician before applying any of these suggestions.

  • Thanks for that, I really didn't want to change from armour and glad to know that t4 dropping is not unusual

  • T3 is the active thyroid hormone which regulates the metabolism and therefore the symptoms.

    T4 is the inactive form and needs converted to T3 to become active.

    Your results suggest that the body is trying to maximise the T3 level by converting as much as possible of the T4 to T3, causing the lowish free T4.

    Some people need high levels of T3 to feel well so I would not be concerned about the free T3 being slightly above range, so long as you do not have any symptoms of overstimulation.

    I also do not see any benefit in adding Levo.

  • these labs are normal on armour. you would need a dose increase and not, use labs as a guide!!

You may also like...