My Endo continues to "threaten" to reduce the 5 mg T3 I take along with the 75 Levo. The last test of TSH was just in range. I am wondering if my TSH is showing I am on too high a dose, or is it normal to have a low TSH when on T3, even if it is a very small dose. I also have my Vit D result listed and would like a bit of feedback on that. Endo thinks it is okay and warns of not taking too much to bring it higher. I take blood tests as directed continually here on the forum.
Please give your opinions. It is much appreciated. Thank you.
TSH 0.28 mIU/L - 0.40 - 4.50
FT4 1.3 ng/dL - 0.8 - 1.8
FT3 3.0 pg/mL - 2.3 - 4.2
Vit D - 40 ng/mL - 30 - 100
Written by
saritadelmar
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The problem is your TSH is too low because your pituitary is under performing, not too much thyroid hormone. T3 doesn’t suppress TSH any more than T4 apart from it being more potent. Five mcg L-T3 is nothing, you need at least 10 mcg.
I would supplement vitamin D a little with the winter coming.
Thank you for your response. The small dose of T3 made a radical change for the better when I started taking it last November - even on the first day. I wonder whether a higher dose of T3 would lower my TSH even more, and really throw my Endo into a fit.
I should have mentioned that I am supplementing Vit D. I take 4000 IUs daily. So perhaps I need an increase?
If you feel a little more L-T3 would help or is needed then try it.
If this causes your endocrinologist to have fits all I can suggest is they get a better understanding of how the thyroid axis works and seek medical attention for their fits.
The Vitamin D level has been measured in ng/mL rather than nmol/L.
40 ng/mL is equivalent to 100 nmol/L.
Optimal is considered to be 40 - 60 ng/mL or 100 - 150 nmol/L, so although there is nothing to stop someone going a bit higher with a level of 40ng/mL it really doesn't have to go much higher, and they may be fine as they are.
I thought it was unlike you to suggest a higher level of vitamin D when it is already at 100nmol/L, so I'm assuming you didn't notice the units.
You’re right I didn’t notice the units. I’m reluctant to assign symptoms to vitamin D deficiency if it is above 20 ng/mL but do accept it is better to aim for a level around 50. This is more important now as there are studies that show a level around 50 or 60 is optimal for a degree of protection from COVID-19.
I need to reread this, I may still be a little mixed up!
Just to confirm a vitamin D level of around 50 ng/mL is about optimal for fighting SARS-Cov-2 infections as can be seen in this study journals.plos.org/plosone/a... .
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Is my TSH level at 0.43 considered low.
Hello everyone, I am new to this forum so just an introduction here
Low TSH, FT4 & Ft3 
They are reducing my medication - but I feel awful
V low tsh
