Latest TSH result is well below range?

[Calceolaria]

Doc sent me for bloods for my ‘routine chronic kidney disease check’, which came back normal btw. However, amidst the raft of other tests, lipids etc, my TSH came back as 0.07, range 0.27 - 4.2. It has been steadily declining over the past two years. ( test taken pre 9am, pre food, pre levo dose etc as prescribed on here.)

If TSH is at its highest at this point, what must it be through the day when it decreases? Am I operating on any thyroid hormone at all? I feel ok.

Of course T3/4 were not requested by the doc.

Many thanks.

[Pandora777]

With a low TSH like that I would think you have highish levels of T4 and T3. You need to find out what they are. Just the TSH is not enough

I feel really well when my TSH is 0.38 I am not taking any levothyroxine btw This is me because I have Graves’ disease

Also TSH lowers through the day mine doesn’t I had a test once one afternoon and it was 0.58 We are all different

[Pandora777]

SlowDragon will advise you what to do

[SlowDragon Ambassador]

Previous post under a month ago

healthunlocked.com/thyroidu...

Have you recently managed to get dose increase in Levo to 100mcg

TSH always drops initially after a dose increase

Were you taking vitamin B complex

[Calceolaria in reply to SlowDragon]

No, I didn’t approach the doc about that for various reasons. I’m still waiting for the call back I was promised. Thank for link to previous result, I can see it went down then up at the last one.

Recently getting on pretty well with Vit B complex. Sometimes I sub for folate or B12 drops. Sleep has been a problem until very recently.

[SlowDragon Ambassador in reply to Calceolaria]

So had you stopped vitamin B complex 5-7 days before test

If not thyroid test results are unreliable

[Calceolaria in reply to SlowDragon]

Oh yes, I did. Might have been 4 days.

Lab comment for TSH was ‘normal’

[Calceolaria in reply to SlowDragon]

It was definitely at least 5 days for vit B complex.

[Pandora777]

I should have looked at your previous posts not just your bio. That is why we have admin they look back at posts.

Anyway I will leave you to the expert who has loads of documents at her fingertips😀

[greygoose]

Am I operating on any thyroid hormone at all?

TSH is not a thyroid hormone. It's a pituitary hormone. When the pituitary senses that there's not enough thyroid hormone in the blood, it increases output of TSH - Thyroid Stimulating Hormone - to tell the thyroid to make more T4 and T3, the thyroid hormones. When the pituitary is satisfied that there is enough thyroid hormone in the blood, it reduces TSH output.

So: High thyroid hormone levels - low TSH

Low thyroid hormone levels - high TSH.

However, for various reasons, the TSH/pituitary are not 100% reliable. And the lower the TSH the less reliable it is. The TSH can be suppressed but FT4/3 can still be too low. Which is why FT4/3 should always be tested. But doctors don't have enough training in thyroid to understand that.

But, to answer your question above, if you're taking thyroid hormone replacement - levo, etc. - you do obviously have some thyroid hormone in your system. Whether or not it is enough is a different question. And just testing the TSH can't answer that.

[Calceolaria]

Thank you. It seems to be taking me an unwarranted length of time to come to grips with this!