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  • How low can TSH go?

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    Old 02-20-2010, 09:01 AM   #1
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    How low can TSH go?

    I have a wonderful GP that will dose based on symptoms. The endo I have will dose based on TSH only. If it were up to him he would have me hypo forever. My last TSH was 0.269 which is low. My ft3 was 2.9 (2.0-4.4) and my ft4 is 1.04 (0.82-1.77) these were taken last week. I am going in on March 2nd for more labs. I am scared to raise because I have been having heart racing when I get up and move around and I actually tried to run the other day and I thought my heart was going to beat out of my chest. It was scary! The endo said they don't like TSH to go too low because it causes heart problems. I just received my saliva cortisol test results and they were high, I have high cortisol. I am also experiencing severe anxiety. Also, I developed Thyroid Eye Disease when I took extra T3 with my Erfa, my eyes don't seem to be sticking out as much but I definately have the hypothyroid look with bags above and below them. I originally had the stare look. I am so confused and don't know what to do! Can anyone help?

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    Old 02-20-2010, 11:14 AM   #2
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    Re: How low can TSH go?

    At my most hyper state (that I am aware of) my TSH was .025 and I had the racing heart, tremors, insomnia, etc. I think it can go so low that its undetectable?

    Old 02-20-2010, 12:26 PM   #3
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    Re: How low can TSH go?

    Originally Posted by lulu2008 View Post
    I think it can go so low that its undetectable?
    That's right. Mine has been that low for yeas and I've left it out from my lab regime (I know it's undetectable without measuring it). Low TSH on HypoT meds doesn't necessarily indicate HyperT - it often does but doesn't cause the symptoms in itself - excess thyroid hormones do that. When on a T3 supplement TSH is easily suppressed (like in my case) so it's pretty much useless when determining the right dose is concerned.

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