Thyroid UK
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Low BMI and Antibodies

This may be a silly question but are women with low BMI likely to be affected more by slightly elevated thyroid autoantibodies- thyroid peroxodase antibodies than larger women.

The theory I am thinking is that my antibodies are 109 but BMI is only 15.2 so these antibodies may be felt more greatly in a person like me, hence miscarriages. Whereas if you have a larger women and the thyroid antibodies of 109 it may not affect her as much?

Just something that's on my mind.....

8 Replies


I think everyone is effected by a high thyroid antibody count no matter what their weight but maybe the severity might depend more on genetics.

High thyroid antibodies are proven to heighten the risk of miscarriage & must be controlled before conception to reduce risks.


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if your BMI is 15.2 unless you are very short (under 5ft) or very tall (over 6ft), so the indexes are completely useless, then you are seriously malnourished. That alone would cause problems.

I presume it's a typo and you are just upset, when in reality it's not your fault. I noticed from some of your previous posts some medical practitioners you saw weren't the most knowledgeable and helpful.


I'm 5'2 and weigh 6 stones. I conceived my daughter with this weight who is perfectly fine. I'm just naturally slim. I have had regular cycles with this weight since I was 13. And conceived my daughter first try without issues. The only thing that has happened after her I have thyroid antibodies. I hear pregnancy can trigger this off...


Still not your fault or hers.


Dont understand... Im not saying it's anyone's fault. Sorry just a little confused :s


You are trying to make sense of something that no one can logically make sense off. Often that involves some blame on events or yourself.


Oh ok. I understand. I belive there's some science behind it, hence , all the testing :)

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Hi Orangiepie, given most other replies I'm with you on your post.

I have many antibodies but not a low BMA, it's good now, where it was once above the guidelines.

There is often something somewhere, behind it all, it will involve a lot of time, patience and Internet research on your part though if you want to know. You'll have to do what the doctors don't, because they don't make the health connections.

Its your whole health history that will count - thats the time and patience bit of it. It's something I'm on verge of finalising for myself and I do have 2 autoimmune conditions.

TB was the 1st when I was a baby. Hashimoto's being the 2nd and only more recently diagnosed in 2015. I'm 68 now.

Neither of those AI's triggered my online research, it was the fact that I had a spontaneous brain haemorrhage, no symptoms, or warning signs till the moment the aneurysm shot up back of my next in 2013 - that was a life-threatening event I was VERY lucky to survive! The research has also shown the probability was that it was a foreseeable event that could have been prevented, but I have to go back many years to prove it and am convinced I can because of the ongoing links I've found.

websites I have used for my own research include:-)

Wikipedia - a 1 or 2 word search for condition 1st. That gives links to HonCode and Trusted Health websites, also scientific research papers. I always check out for reliability because so many sites just want to promote products they are selling. - I signed up to it. There I can start my own health account on that, listing previous/current ealth conditions I can also enter what prescribed meds I take, singly or check for contraindications against other known meds. It's best to choose Manaufacturer of yours, and also put your dosage. I also now am extremely selective as to whether or not I will take what I've been prescribed till after I've checked it out. (I have to check all mine out because manufacturers enclosed in box leaflet is all in French, so for me an English language multinational website is best and quicker.)

You can also elect to receive emails from them on updated research. New drugs or even drug warnings if they - are withdrawn. - with a lot of info.

Labtestsonline - explains meanings of the various blood lab tests done.

Of course there is also Health Unlocked, the British organisation we are using now, for support and information, but you do have to be selective about what you choose to follow or do yourself, in terms of the often many replies you receive because of course we are all anonymous. So being able to read between lines and have a good judgement helps you.

Here on Thyroid UK, I find the admins very knowledgeable when it comes to interpreting Thyroid blood tests. It's probably the same on many other Communities that are well represented and moderated.

Unless they say so, none of us are medically qualified, myself included but like you I wanted some answers and yes it DOES help when you can trace a sequence of events to find at some point the root cause.

There are American/English and multinational websites listed. If you live in UK you'll get more info from NHS also, more relative to how it operates there.

I cannot and won't subscribe to the viewpoint that what happened before doesn't count! When you can find the name of the disease/event that triggered things, give it a name if it's still underlying, that when hopefully basic treatment can start. Drs will only respond to what they are aware of.

Specialists will only treat/talk about their own speciality going on what the GP's tell them or not in the referral letter - as was proved to me here yesterday.

I wish you luck in your searches if you do them, but don't let stress get to you, keep living your daily life and enjoy your family. :-)


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