Test free T3 after dose adjustment: Since half... - Thyroid UK

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Test free T3 after dose adjustment

Clara9 profile image
2 Replies

Since half life of T3 is about 24h and half life of T4 one week would it be possible to have a blood test after a week (8 days) after an adjustment of only the T3 (same dose T4). I was thinking that you need to wait around 6 weeks for T4 to be correct wouldn't it make sense to be able to get correct results of T3 after 6 days?

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Clara9
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SeasideSusie profile image
SeasideSusieRemembering

I have spent a couple of years tweaking Levo and T3 to find my optimal doses, I have found that whichever hormone I changed then I still needed 6-8 weeks for levels to settle. I don't think you'll get a correct FT3 result 6 days after changing your T3 dose.

Lalatoot profile image
Lalatoot

No the body all works in harmony. If you alter your T3 dose then the rest of the body has to catch up with what is going on and levels need time to adjust as do all the various interactions.

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