Thread: Exogenous T3 effect on my bloods TSH/Free T4/Free/T3

Ok really didnt know where to put this one, sorry if it's not in the right place.

I had blood drawn 15 hours after my last 75mcg dose of Tiromel.
I expect to see low TSH number since my body production is shutdown by the use of exogenous T3, but i thought i would have see high Total T3 number.

So for the first drawn :
TSH : 0.480 mU/L (0.380-5.330) Expected as i'm shutdown with exogenous T3
Free T4 : 3.7 pmol/L (7.8-19.2) Why so low?
Free T3 : 1.2 nmol/L (1.3-2.8) Why so low?

Second drawn 65 hours later :
TSH : 1.379 mU/L (0.380-5.330) Already back ''ON'', this number looks like my every year TSH check-up
Free T4 : 7.8 pmol/L (7.8-19.2) Double but still on the low side
Free T3 : 1.0 nmol/L (1.3-2.8) Even lower, what the hell?

Anyone can help figure this?

Originally Posted by Cmack053

This is why ive been iffy about using t3.
From the research ive done which has been aloot.
IMO you are correct in knowing tsh would be low. But t4 is converted into t3. Since youve been taking t3 your body will slow production of t4 thus the lower number. Also the low t3 number in the first test is most likely due to t3s active life of around 24 hours. Its in and out fast. The second test being low across the board tells you that you sre in fact shut down a little still but from all of the studies ive seen people have bounced back fairly quicly using much higher dosages.

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Thx for the reply, seems logical!