Blood test protocol for T4 and T3 - help needed please

[Slowrunner1208]

Hi, I’m sure I’ve read the protocol’s somewhere and I’ve searched but can’t find them. Can anyone help?

I take levothyroxine (from GP) and liothyronine (privately sourced).

After my trial of lio I’ve reduced my levo dose and it’s time to do blood test. I take the medications together and through the night, usually between 1 - 4 am.

Should I miss one night and do the bloods next morning? Do I need to do different things for levo and lio?

Any advice much appreciated and thanks!

[TiggerMe]

24 hours after levo, 8-12 hours after lio, pre 9am water only before test 🤗

[SlowDragon Administrator]

pinned post here all about when (and why)

If you normally take levothyroxine at bedtime/in night ...adjust timings as follows prior to blood test

If testing Monday morning, delay Saturday evening dose levothyroxine until Sunday morning. Delay Sunday evening dose levothyroxine until after blood test on Monday morning. Take Monday evening dose levothyroxine as per normal

T3 Day before test

Split T3 as 2 or 3 smaller doses spread across the day with last dose 8-12 hours before test

healthunlocked.com/thyroidu...