Latest Thyroid Function Test (Why Is TSH So Low ?) - Thyroid UK

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Latest Thyroid Function Test (Why Is TSH So Low ?)

hypo_guy
hypo_guy

Hi Everyone. I had a Thyroid Function Test this morning and I'm wondering why my TSH is so low despite FT4 not even being mid-range. My understanding, from this website, is that TSH should only be this low when FT4 is much higher, given that I'm on Levo only (no Liothyronine/T3).

>Latest Thyroid Function Test (Jun 2017):

Free T4: 14.4 pmol/L (11.00 - 22.60 pmol/L)

TSH: 0.06 mu/L (0.2 - 4.00 mu/L)

>Thyroid Function Test (Jan 2017):

Free T4: 14.9 pmol/L (11.00 - 22.60 pmol/L)

TSH: 0.02 mu/L (0.2 - 4.00 mu/L)

I was diagnosed in December 2016. Before Levo, TSH was 5.6, T4 10.8. I'm on 100mcg/day of Levo.

Any help, much appreciated.

Cheers!

1 Reply
oldestnewest

Thanks reallyfedup123.

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