T3 before blood test?: I want to get my blood... - Thyroid UK

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T3 before blood test?

MissFG profile image
5 Replies

I want to get my blood test as accurate as possible on Tuesday as I know I’m so close to being on the right dose.

I take 31.25mcg every morning. How would you suggest I take my T3 on Monday before my blood test Tuesday at 9am? Should I take 18.75mcg Monday am and 12.5mcg Monday night?

Then take my usual dose after my blood test?

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MissFG profile image
MissFG
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5 Replies
trelemorele profile image
trelemorele

Who are you doing bloods for?

Yourself or GP?

If GP, don't take t3 at least 12-14 hours before bloods.

If for yourself either the same or anytime after peak which is around 2.5 hour after ingestion depending what you're trying to get out of that data.

MissFG profile image
MissFG in reply to trelemorele

Thanks but not sure what you mean?

The bloods are done at my gp’s I arrange them for myself as and when I need them. I just want to check my dose and FT3 level to ensure I’m optimal and not over range.

So should I split my dose Monday so I take some 12 hours before blood test or just take it Monday morning as usual? Then nothing Tuesday morning until after test. Just not sure if to get an accurate FT3 I need to take some 12 hours before?

trelemorele profile image
trelemorele in reply to MissFG

Fair enough.

Go with seaside Susie advise

SeasideSusie profile image
SeasideSusieRemembering

MissFG

I do exactly as you have said.

Split your daily dose, take the last dose at 9pm-ish then after blood draw on Tuesday take as normal.

MissFG profile image
MissFG in reply to SeasideSusie

Great thanks SeasideSusie

Thought I needed to take some 12 hours before just so I have some in my system as I usually take it all every morning first thing. Need to get this one right

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