How to prepare for my thyroid test?: Hi all, I... - Thyroid UK

Thyroid UK

141,183 members166,425 posts

How to prepare for my thyroid test?

TiredMummy profile image
7 Replies

Hi all,

I’m on the following routine and wondered what I should do with my thyroid medication the day before the test:

First dose: 3am - 125mcg Levo, 5mcg - T3

Second dose: 11am - 2.5mcg T3

I will do the test around 8am ensuring I’ve only had water. So should I NOT take the 11am T3 dose the day before as well as the 3am early morning levo/T3 dose? Or am I supposed to take all my thyroid meds together say 6am the day before?

Also, is it just no vitamins within 24 hours of the thyroid test but 48 hours after biotin and iron?

Thanks for your help x

Written by
TiredMummy profile image
TiredMummy
To view profiles and participate in discussions please or .
Read more about...
7 Replies
Rapunzel profile image
Rapunzel

Hello TiredMummy. Blimey you have your hands full. Our kind of tired and being a Mummy! I know many thyroidies do this and a cuddle to you all... the very idea of having thyroid issues and children to raise fills me with trepidation (for the safety of my children!) Luckily for them, I wasn't diagnosed until they were in their late twenties!

Hope you find this useful - Radd is a very wise thyroidie and I have followed her protocol with some degree of success (in that my GP leaves me alone as my levels when I do a blood test for him fit mostly within his parameters) You may find the marvellous helvella useful, too

healthunlocked.com/thyroidu...

helvella.blogspot.com/p/hel...

TiredMummy profile image
TiredMummy in reply toRapunzel

Thank you Rapunzel, I’ll have to try and get my head around it all!

TiredMummy profile image
TiredMummy in reply toRapunzel

I managed to get my head around it mostly and Slowdragon has given me the confidence that I’ve understood correctly! Stupid brain fog! Thank you for your help 🙂

jimh111 profile image
jimh111

The T3 doses are small and will have very little effect. You could take them before you go to bed. Any reason you take them at 3 am?

TiredMummy profile image
TiredMummy in reply tojimh111

Thank you Jimh111, I naturally wake up around this time to use the bathroom and I think I’m feeling some benefit from taking it around this time.

SlowDragon profile image
SlowDragonAdministrator

so stop any supplements that biotin 5-7 days before test

Also iron supplements same

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

2 days before test …..delay Levothyroxine dose until 7-8am next morning (day before test)

Day of test delay morning Levo until after test

So …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 night before test take T3 at bedtime rather than 3am

TiredMummy profile image
TiredMummy

thank you Slowdragon that makes sense and I came to similar conclusion late last night and took my Levo at 6am this morning. I will take it at 7am tomorrow and after the blood draw on the following day (test day). I was thinking of taking my last T3 dose at 3pm on the day before the test (8 hours after the first dose at 7am with my Levo) so will taking it at bedtime be better for the test? I wonder if I will feel better doing this generally….

Not what you're looking for?

You may also like...

How to prepare for the next blood test

I was advised a few months ago on this forum to have my endo increase my Levo from 88 to 100 mcg. I...

Taking last dose of levo prior to thyroid blood test

@[78643] Hi Susie, I've seen several times that, like me, you take your Levothyroxine in the small...
Caroline888 profile image

Do I need to fast for Thyroid blood test?

Hi - I need to take my thyroid test in a couple of weeks. Do I need to fast before taking the test?...
Allen-P profile image

when to take thyroxine for 11am blood test?

hi there, I have a blood test for my thyroid levels booked for 11am. I currently take my thyroxine...

Suggested Thyroid Hormone Test Timing Protocols

These suggestions are gleaned from years of members experience to best achieve an average reading...
radd profile image

Moderation team

See all
RedApple profile image
RedAppleAdministrator
SlowDragon profile image
SlowDragonAdministrator
Jaydee1507 profile image
Jaydee1507Administrator

Content on HealthUnlocked does not replace the relationship between you and doctors or other healthcare professionals nor the advice you receive from them.

Never delay seeking advice or dialling emergency services because of something that you have read on HealthUnlocked.