T3 & Low TSH Feeling rough Advice Please - Thyroid UK

Thyroid UK

140,928 members166,050 posts

T3 & Low TSH Feeling rough Advice Please

Otto11 profile image
16 Replies

Hi all

I'm sorry I still havn't completed my profile so a brief history. Undermedicated for years by GP but eventually seen by Endocrinology last year & started T3 in December 2023. I have slowly been increasing my T3 dose & reduced my Thyroxine T4 to 75mcg. My current dose of T3 is 10mcg am & pm.

Results on 4th Jan 24 - TSH 0.44 (0.27-4.2) T4 19 (11-22) & T3 3.8 (3.1-6.8)

Results on 24th Jan 24 - TSH 0.13 T4 16 & T3 4.2

Today's results 1st March 24 - TSH 0.03 T4 14 & T3 4.5

On the whole I have been feeling brighter with a bit more energy which is great but then 4 days ago I have been feeling awful & its virtually impossible to keep my eyes open just needing to sleep most of the day for no obvious reason. Also have a bad headache & pounding heart beat (both bearable).. I have a follow up phone appointment with my Endocrine Nurse next Wednesday but have a really busy weekend ahead so i'm just wondering if my low TSH could be responsible for the sleepiness. It may be unrelated as I'm still learning so any help greatly appreciated.

Written by
Otto11 profile image
Otto11
To view profiles and participate in discussions please or .
Read more about...
16 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

is this how you do your tests

Do you always get same brand levothyroxine and T3 at each prescription

Your Ft4 has dropped at each test and now very low …..probably too low

19…….17….14

How much levothyroxine were you taking BEFORE reducing to 75mcg

You need to increase levothyroxine back up at least 12.5mcg per day

Retest in 6-8 weeks

You may then need to increase T3 by 5mcg after next test

Many on levothyroxine plus small doses of T3 find they need BOTH Ft4 and Ft3 at least 60-70% through range

currently only

Free T4 (fT4) 14 pmol/L (11 - 22) 27.3%

Free T3 (fT3) 4.5 pmol/L (3.1 - 6.8)37.8%

Very common on T3 for TSH to be very low or suppressed

What vitamin supplements are you taking

When were vitamin D, folate, B12 and ferritin last tested

Otto11 profile image
Otto11 in reply toSlowDragon

Hi thank you for your quick reply. I always do blood tests as per protocol & took my last dose of T4 24hours prior to test & followed protocol for T3 too. Today however although I was at the hospital before 9 it took till 11am to get my bloods taken. Only 1 phlebotomist for the whole hospital! I was taking 100/125mcg prior to starting T3 in December. This reduced to 100mcg /75mcg at the beginning of January then to 75mcg at the end of January. I was initially taking Mercury 25mcg tablets x3 daily but 2 weeks ago I was prescribed 50mcg tablets which are Accord. (I did take 100mcg Accord tablets previously so I have had those in the past quite recently until December) My Vitamins were last tested in November 23 prior to starting T3 they were B12 755 ( I had a B12 injection just prior to blood test), Folate 8.8 Ferritin 77 & Vit D 89. I'm currently taking Methyl folate drops but not every day as also taking B Complex but with Folic Acid not Folinic Acid as bought them before I knew the difference. I could do another private test as I doubt GP would do them again. Or I can ask my endocrine Nurse on Wednesday although they have never mentioned vitamins to me at all! I have learn't that from you. Thank you very much for your help I hope this all makes sense.

SlowDragon profile image
SlowDragonAdministrator in reply toOtto11

You may need to be back on 100mcg daily

But initially perhaps just increase to 87.5mcg daily

Cut a 25mcg in half

I was on 125mcg daily before adding T3

Initially reduced to 100mcg …..Ft4 dropped to 14 after 5 months….felt dire

Eventually settled on 125mcg 4 days and 112.5mcg 3 days per week…..this keeps Ft4 steady at around 18 (12-22)

Otto11 profile image
Otto11 in reply toSlowDragon

Thanks. Sorry you’ve been in a similar situation. It’s certainly not straightforward that’s for sure. I’m off to find a sharp knife. Thanks again.

SlowDragon profile image
SlowDragonAdministrator in reply toOtto11

Craft scalpel…..Like this

aosonline.co.uk/swordfish-m...

Otto11 profile image
Otto11 in reply toSlowDragon

Thanks.

greygoose profile image
greygoose

The TSH itself doesn't cause any sort of symptoms, whether it's high or low. It's T3, the active hormone, that does that. And yours is a little on the low-side. You need and increase in dose. :)

Otto11 profile image
Otto11 in reply togreygoose

Thanks. so an increase in T3 but not T4 Yes?

greygoose profile image
greygoose in reply toOtto11

Well, your FT4 is also low, but you can't increase both at the same time. Personally, I'd increase the T3 first and then see how you feel. You can increase the levo at a later date.

Otto11 profile image
Otto11 in reply togreygoose

Ok Thanks. I’m just a bit concerned I run out of T3. But aware I need to do something.

SlowDragon profile image
SlowDragonAdministrator in reply toOtto11

If you increase Levothyroxine, this should also increase Ft3 as levels of Ft4 increase

Otto11 profile image
Otto11 in reply toSlowDragon

OK that's good. thanks. I increased dose for the last 2 nights by 12.5mcg & will see what happens.

greygoose profile image
greygoose in reply toOtto11

Yes, increasing levo would increase your FT3 slightly but would it be enough? I imagine that the reason you started T3 in the first place is because you are a poor converter. So, that might work and it might not. No guarantees.

Otto11 profile image
Otto11 in reply togreygoose

Thanks. This is all a learning curve. Yes I am a poor converter having been undermedicated by my GP for years. I initially increased Thyroxine from 75mcg to 125mcg as advised by Endo but T3 was still low. It is slowly improving but suddenly last week I'm white washed. It came on suddenly just out of nowhere late afternoon & cant keep my eyes open for long.I'm going away next week & don't even have the energy to pack. Oh well I will see what my Nurse says on Wednesday. Thanks again.

greygoose profile image
greygoose in reply toOtto11

In that case, there's not much you can do except try and get some T3 to add to your levo.

Otto11 profile image
Otto11 in reply togreygoose

Ok. So you think I should increase both?

Not what you're looking for?

You may also like...

Dose changes advice please

Hi new member here I would like to know why my dose keeps getting changed? I had my dose of...
Sasha18 profile image

Started T3 Trial feeling rough advice again please

Hi I hope you all had a good Xmas. I started a trial of T3 on 9th December & have been following...
Otto11 profile image

T3 taken away, looking for a new source please :)

Hi I am new to the site. Sorry this might turn into a very long post. I was diagnosed hypothyroid...
Saffron2018 profile image

Low TSH

Hi just a quick question. I’ve posted before but not managed to fill in my profile yet. I had a...
Otto11 profile image

High Tsh, High Free T4 and low Free T3 - HELP PLEASE

Hi Everyone, I am hoping I can get some advice. I have been on levothyroxine for 6 years. First...
Bubbap profile image

Moderation team

See all
helvella profile image
helvellaAdministrator
Jaydee1507 profile image
Jaydee1507Administrator
PurpleNails profile image
PurpleNailsAdministrator

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.