Last dosage before blood test: Can anyone advise... - Thyroid UK

Thyroid UK

137,805 members161,630 posts

Last dosage before blood test

sara0322 profile image
2 Replies

Can anyone advise when to stop taking medications before getting bloods taken, I'm booked in to get bloods done on Tuesday morning on 26th March.

The medication I'm on are:

Levothyroxine 125mg (Mon to fri)

Levothyroxine 100mg (sat to sun)

Liothyronine 10mg (daily)

Pregnacare max (daily)

Vit d3&k (4000iu)

Labetol 600mg (daily)

Folic acid 5mg (daily)

I usually take Levothyroxine and Liothyronine at 7/7.30 am and the rest of medications 4 hours later.

Thank you

Written by
sara0322 profile image
sara0322
To view profiles and participate in discussions please or .
Read more about...
2 Replies
SlowDragon profile image
SlowDragonAdministrator

Recommended that all thyroid blood tests early morning, ideally just before 9am, only drink water between waking and test and last dose levothyroxine 24 hours before test

This gives highest TSH, lowest FT4 and most consistent results. (Patient to patient tip)

T3 ….day before test split T3 as 2 or 3 smaller doses spread through the day, with last dose approximately 8-12 hours before test

So 5mcg waking and 5mcg at around 8pm

Or 5mcg waking, 2.5mcg mid afternoon and 2.5mcg at 8pm

Do you always get same brand levothyroxine at each prescription

sara0322 profile image
sara0322 in reply to SlowDragon

Thanks for that, appreciate it. Sometimes I do get same brand but there are some occasions they would give me different brand when ordering repeat prescription.

You may also like...

Dosage before a blood test

25mcg of T3. I take both upon waking. I’m having my blood drawn on Thursday morning about 8.30am....

When to take the last T3 dose before a blood test.

day before blood test; will 24 hours after that dose be too long without T3 in the blood, and result

Levo before a blood test

read online that if I take my levothyroxine on a morning and I have a blood test booked for on a...

Advice on last blood test

and have been on levothyroxine only for the last years. Have been prescribed liothyronine by the...

Meds before blood test

seen that it is recommended to not take levothyroxine before a blood test. Would that apply to me...