Meds before blood tests : Can anyone please help... - Thyroid UK

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Meds before blood tests


Can anyone please help me with timings of medication prior to blood tests?

I have always had bloods taken at 8.30am or thereabouts and have not taken the day’s dose of levo until I got home. Now I also take T3. 125mcg levo and 10mcg T3 all taken first thing in the morning. If I don’t take any T3 after the previous morning’s dose it would put me outside the 8-12 hours before window that has been suggested on the forum.

Can anyone on a similar regimen advise re timings please?

2 Replies


I take both Levo and T3, normally first thing in the morning in one dose.

When I'm doing blood tests, for one day only, the day before the blood draw, to ensure I follow the timing for T3, I split my T3 dose and take the first dose of T3 with my Levo at around 8.30am (I know I will do my test at 8.30 the next day) and the second dose of T3 between 8.30pm and bedtime.

Thank you SeasideSusie. That makes perfect sense. I’ll write a big note to self to remember to do that the day before.

Thank you again.

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