Thyroid ranges for pregnancy

[Molly161018]

Please can anyone advice what the normal ranges are for thyroid hormones in pregnancy? I believe they're different from the normal ranges...?

I've just had a call from the midwife re my test results (taken at 10 weeks) which are as follows:

TSH <0.03

T4 19.1

T3 5.9

Obviously they're worried because my TSH is too low... which doesn't surprise me at all...I'm prescribed 125mcg thyroxine and increased this to 150mcg when I found I was pregnant, and I self medicate with 12.5mcg of liothyronine which is probably what is surpressing my TSH.

I'm seeing a specialist at the hospital in a few weeks...but the midwife has advised me to call my GP in the meantime, but I don't know whether to as the last thing I need is for my thyroxine to be reduced!!!

I would be glad of confirmation that this TSH is fine for pregnancy (if I understand it I'll be better at convincing the GP/specialist if need be!!)

And any advice or comments on these results would be appreciated!

Thanks in advance!!

[SeasideSusie Remembering]

Molly161018

There are no standard ranges for thyroid tests so your own area will have the ranges that are appropriate to you. They should have ranges for each trimester of pregnancy.

For a successful pregnancy TSH generally should be below 2.5

[Molly161018 in reply to SeasideSusie]

Thanks SeasideSusie - I will try and find out.