Low TSH on NDT

[matty220]

My TSH was always low, even on Levo but I understand it can be even lower on NDT. Is this right and why is this?

Thanks

[Marz]

Because NDT contains T3. This informs the Pituitary in the feedback loop that there is adequate thyroid hormone. This prevents the Pituitary Gland pumping out TSH - as there is no need to stimulate the thyroid .....

thyroiduk.org

Everything about the thyroid in the above link 😊

[jacrjacr]

always look at your free t3 free t4 on test especially on ndt

[matty220 in reply to jacrjacr]

Thank you. I'm very lucky that, even while I was on Levo, the lab did my T3 as my TSH was always low, out side the acceptable range. I always managed to persuade my doc not to reduce my dose as I wasn't feeling so great! I've always asked for a print out of my blood results - whatever they are for, so have results going back over 5 years and can see a pattern of how, as my T4 went up my T3 went down. I even said to my doc 'do you think I have a conversion problem?' but he didn't answer, probably because they don't really know about that do they!!