I take approx 90 mg T4 daily plus 5mg T3. Since the TSH is not actually suppressed and the other results are reasonably within range, should I be concerned? I am cautious as I had atrial fibrillation and osteopenia, both of which seem to be linked to suppressed TSH. Have not had AF since reducing my thyroid replacement doses.
My last TSH test via GP in December 2018 was
TSH 0.2 (mU/L 0.2 - 4.5)
GP has not raised any concerns over this.
Thanks.
Written by
Coachv
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I take T4 100 mcg four times a week and 75 mcg three times a week, which averages out at 89 mcg a day.
I did try taking 10mcg T3 and less T4, as advised by an endocrinologist, but this suppressed my TSH and also free T4 level was right down.
I read quite a lot of research which suggests that suppressed TSH is linked to heart arrhythmia, and reduced bone density, so am very cautious about this, as I am in my 60s. The current dosage seems okay, although ideally I would like to take 10 mcg of T3, which I took for many years until I developed atrial fibrillation.
It would be great if this whole issue was much better researched, as I feel I am experimenting on myself.
I did try taking 10mcg T3 and less T4, as advised by an endocrinologist, but this suppressed my TSH and also free T4 level was right down.
That's generally what happens when adding T3 into the mix. It amazes me that doctors who prescribe T3 don't seem to know the effect it can have on test results.
So you need to test vitamin D, folate, ferritin and B12
Low vitamins can lower TSH
Though it's extremely common for TSH to be suppressed on even tiny dose of T3
Most important are FT3 and FT4 levels
Recommended on here that all thyroid blood tests should ideally be done as early as possible in morning and fasting. Do not take Levothyroxine dose in the 24 hours prior to test, delay and take immediately after blood draw. This gives highest TSH, lowest FT4 and most consistent results. (Patient to patient tip, best not mentioned to GP or phlebotomist)
on T3, make sure to take last dose 8-12 hours prior to test
Is this how you do your tests?
Do you have Hashimoto's? Autoimmune thyroid disease diagnosed by high thyroid antibodies?
If so are you on strictly gluten free diet
Low fT3 (common on T4 mono therapy) may linked to osteoporosis and af
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Medicheck Dr's notes suppressed TSH with low T4
Where on range should I be please?
low tsh 
Low TSH on Levothyroxine
Test result help please?: Low TSH and Low T3
