Suppressed TSH

I have been on levothyroxine (now up to 100) since April as we're trying to conceive and previous TSH were usually higher than 3, sometimes up to almost 5. My T4 level is now 17 which is fantastic and what my private endo recommended the level was at. My THS is suppressed at 0.04. Would a very low THS negatively affect fertility? What is more important, the T4 or the TSH level?

7 Replies

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  • Bumbo, it's TSH >2.0 with low FT4 which can make conception difficult and increases the risk of miscarriage. Some people need TSH suppressed to achieve good levels of FT4. Reducing dose to allow TSH to rise will mean an inevitable drop in FT4. Studies have shown that children of hypothyroid mothers who had low FT4 during pregnancy have lower maths and language skills at age 6-8. I'd prefer good FT4 and wouldn't be concerned about the low TSH.

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    I am not a medical professional and this information is not intended to be a substitute for medical guidance from your own doctor. Please check with your personal physician before applying any of these suggestions.

  • Thank you clutter. That's really interesting that you mentioned about maths and language skills of children of hypothyroid mums. I had read that if a mum is hypothyroid during pregnancy, it has an effect on the child's IQ by a few points, which is anyther reason why I'm glad I'm being treated... Only problem is that I have no child yet!

    Is it possible to fall pregnant with a suppressed TSH level?

    If so then I don't have to fret that I'm on the wrong dose, but when you're trying to conceive for soooooo long, it seems that everything you do is the wrong thing to do! it's easy to blame anything for not falling pregnant when you're told there's nothing wrong with either of us.

  • Bumbo, everything I've read has said high TSH makes it difficult to conceive. I've not seen anything to suggest low TSH is a problem, and if it was, hyperthyroid women wouldn't conceive, but they do :)

    Low TSH doesn't mean you are on too high a dose as long as FT4 is within range, which yours is.

    I hope you'll be successful soon. My sister had inexplicable infertility but after a procedure blew air through her to see whether there were blockages she conceived naturally and my lovely niece is 25 now.

    _______________________________________________________________________________

    I am not a medical professional and this information is not intended to be a substitute for medical guidance from your own doctor. Please check with your personal physician before applying any of these suggestions.

  • So do women with very low THS fall pregnant? That's reassuring :). It's taken over 6 months to get my T4 up but I was now worrying about TSH, especially as I had my yearly nhs endo check recently (not for thyroid as they have told me over and over again there's no problem, but for my prolactin) and she said I'm overmedicated and my TSH shouldn't be that low which will make it difficult for me to conceive... However they are the same endos who told me I could conceive normally with a TSH level of almost 5.

    That's great that worked for her :) I had something similar done January 14, where they inject some sort of ink and they xray to check for blockages. I had read that some women fall pregnant after this test, even if there are no obvious blockages, so I lived in hope the first few months of 2014 but it wasn't to be for us yet. hopefully we'll have our happy ending like your sister did!

  • Sorry, I keep typoing tsh to ths!

  • It depends how you feel not on numbers. You are a person not a bunch of numbers.

  • Hi

    My level were 1.81 when I conceived I was always told to try and have levels below 2 when trying.

    Good luck x

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