High Free T4

[Ashanat]

Hi there, I’ve been on a steady dose of t4 150mcg and T3 28mcg for over 18 months. My relevant vitamins and minerals are all good too.

A year ago my results were upper range for T4 and just past mid range T3. The only thing that has changed is that I now use near infrared sauna and I have resolved adrenal issues.

My T4 in now over range and I have reverse T3. Overall feeling pretty good but not tolerating exercise well (I crash)

For the last week I have cut out my T4 and just taken my usual T3.

I’d really appreciate insights into good next steps and how long I should keep cutting out the T4.

Thanks 😁

[greygoose]

Did you leave 24 hours between the last dose of levo and the blood draw? And 12 hours for the T3?

[Ashanat in reply to greygoose]

Hi greygoose, yes, I left a full 24 hours between both and the blood draw.

[greygoose in reply to Ashanat]

If you left 24 hours between your last T3 dose and the blood draw, your FT3 is quite a bit higher than that. It will be well over-range.

Has this sort of thing happened before? Looks to me like you've just had a Hashi's 'flare', even though your antibodies are low. Have you ever had an antibody test that was high?

[Ashanat in reply to greygoose]

Hmm, no I’ve always had very similar antibody results.

I wonder if it’s due to the near infrared sauna. I gives me a huge energy boost and there are studies showing that some subjects came off thyroid meds after using in the experiment.

Re the high T4, I’m wondering how long to stay off taking?

[greygoose in reply to Ashanat]

I think you should be more concerned by the high FT3.

[Ashanat in reply to greygoose]

Thanks, why would the high free T3, still in range be a concern if I’m feeling well?

[greygoose in reply to Ashanat]

But it won't actually be in-range, because you left 24 hours after your last dose before the blood draw. It should only be 12 hours maximum. You have a false result, there, it is actually higher than that.

[Ashanat]

Ok, but I read up lots on here and online about how long to leave and 24 hours was the consensus. For consistency in comparing results I’ve done exactly the same on each occasion

[SeasideSusie Remembering in reply to Ashanat]

Ashanat

but I read up lots on here and online about how long to leave and 24 hours was the consensus

That is when people take Levo only. When people mention that they also take T3 or that they take NDT then you will see that the answer is always to leave off Levo for 24 hours and T3/NDT for 12 hours.