T4 level: Hi all, My GP agreed for me to trial... - Thyroid UK

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T4 level

Lasagnebread profile image
2 Replies

Hi all,

My GP agreed for me to trial 150mg levothyroxine to see if I could get my TSH under 2mlU/L which is where fertility want it to be. I had a blood test yesterday and my results have come through today:

TSH 1.23mlU/L (normal range 0.55 to 4.78)

T4 20.3.pmol/L (normal range 11.5 to 22.7)

My T3 wasn't tested. The test was done at 8.40am and I hadn't eaten since the night before and hadn't taken levothyroxine since the previous morning.

I don't know a lot about T4 - does it matter that its the top end of the range? Is there anything I should bring up with my GP?

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SlowDragon profile image
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Levels look good

How do you feel

Ideally you need to get FULL thyroid and vitamin testing

Looking at previous posts you have Hashimoto’s

Exactly what vitamin supplements are you taking

Which brand of Levo are you taking

Do you always get same brand

Are you on gluten free diet and/or dairy free diet

Obviously vitamin levels are especially important pre TTC

You don’t want B12 or folate too low or too high

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)

Private tests are available as NHS currently rarely tests Ft3 or all relevant vitamins

Post all about what time of day to test

healthunlocked.com/thyroidu...

Testing options and includes money off codes for private testing

thyroiduk.org/testing/

Medichecks Thyroid plus BOTH TPO and TG antibodies and vitamins

medichecks.com/products/adv...

Blue Horizon Thyroid Premium Gold includes BOTH TPO and TG antibodies, cortisol and vitamins

bluehorizonbloodtests.co.uk...

Medichecks and BH also offer private blood draw at clinic near you, or private nurse to your own home…..for an extra fee

Only do private testing early Monday or Tuesday morning.

Tips on how to do DIY finger prick test

support.medichecks.com/hc/e...

Monitor My Health (NHS private test service) offer thyroid and vitamin testing, plus cholesterol and HBA1C for £65

(Doesn’t include thyroid antibodies)

monitormyhealth.org.uk/full...

10% off code here

thyroiduk.org/testing/priva...

SlowDragon profile image
SlowDragonAmbassador

Pregnancy guidelines

thyroiduk.org/having-a-baby/

NICE guidelines that if hypothyroid or subclinical you should see endocrinologist BEFORE TTC

cks.nice.org.uk/topics/hypo...

See pages 7&8

btf-thyroid.org/Handlers/Do...

Also here - dose increase in levothyroxine as soon as pregnancy test confirms conception

cuh.nhs.uk/patient-informat...

thyroidpharmacist.com/artic...

Low ferritin, low thyroid levels and miscarriage

preventmiscarriage.com/iron...

Low iron and hypothyroid

endocrineweb.com/news/thyro...

Folate and B12 and Neural tube defects and autism

healthunlocked.com/thyroidu...

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