What changes TSH

[NealF]

Am interested to know what lowers TSH, is it T4 or T3?

Latest results on 75mcg of Levo up from 50 show a drop in TSH, increased free T4 a bit but my free T3 no change.

Thanks

Neal

[greygoose]

Both T4 and T3 can affect TSH.

[humanbean]

You might find this post by diogenes to be of interest :

healthunlocked.com/thyroidu...

[Angel_of_the_North]

Most people report that taking T3 lowers their TSH more, but I find that it's T4. If I take NDT, my free T4 roses fast, my TSH drops below range and my free T3 stays the same. If I take T3 only, my TSH goes up a bit (to bottom of range) and free T4 falls and free T3 stays much the same. Why? I don't know.

[NealF]

Looks like a bit of both then. Thanks for your replies.

Being left on 75mcg, so next up might be trying NDT.