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Low FT4 Low TSH normal T3

My labs came back
FT4   <0.4 ref. range 0.81-1.48
TSH   .21  ref. range 0.35-4.00
T3     133  ref. range    58-159
I take Cytomel 2x's a day; just got a new dr. and he asked if I had ever officially been diagnosed w/ hypo - not officially - symptoms but at the time my numbers were just borderline so dr. wouldn't.
I cant find much on low FT4 low TSH normal T3. Any help would be appreciated.
4 Responses
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393685 tn?1425812522
Well that explains alot. See, Psycholgists will prescribe T3 medication due to anxiety and/or depression - but I am a firm believer they are least likely to know WHY this medication is validated. I know they know that low T3 hormones will bring depression and anxiety up - but that is the only reason why they use it - and they know little - if any - on how to balance the hormones to rid the symptoms.

You were prescribe that medication from the PSY b/c you came in w/ a reference from a doctor on emotional stress and you may have firmed their understanding of this from your doctor at your first visit. That's why the T3 med was given to you - not for a thyroid problem.

The doctor who referred you to see this professional was wrong. He/She only looked at symptoms and NOT thyroid so - ignored your condition and pushed it off emotionally - on you - not an abnormal imbalance.

One concerning thing is starting a T3 medication - it "may" alter your normal function of the thyroid. You may require meds for a long time to return things to a normal again.

Your bottoming out on the FT4 lab b/c of the T3 medication. When you push direct hormone into you body as the T3 medication is doing - you're providing yourself with a "fake" hormone to work as you would normal.. well that's sort of true.

What actually is happeneing is b/c the direct T3 is coming in - your sending a false positive to the pitutiary that saying - you are making enough thyroid hormone so it can back off... but the converter hormone - which is T4 - is not producing and this is not good. the T4 converter is not really an essential hormone that the body "needs.  The T4 converts  into direct T3 and that is your active form for wellness. But if you have no natural T4 converting - which the liver does for you - your liver may become sick and not filtering right either... it a spiral effect on many things..

You are going to another doctor? - You need one. Dump that other one and move on to a doctor that won't allow you to have pills pushed on you - just b/c he/she is too lazy to look at the labs and see what's really wrong.

Many find really good relief thyroid wise and other things with DO's - MD's and GP's that practice Internal or Intergrative medicine.. Try to make sure your seeing one of those.
Helpful - 0
Avatar universal
Back in 2006, went in complaining of hypo symptoms - depression, constipation, fatigue, hair falling out, brittle nails, could not lose weight - etc. First test came back 4.2 - dr. said no, I wasn't hypo. Symptoms worsened - 2007 - tested again - 4.7 - (at the time, the upper end of the reference range was 5.0) dr. said I was not again and sent me to psych. Psychiatrist put me on cytomel - said it would help, could be used to treat depression so he could prescribe it. after being on it, he retested - my levels were
tsh - 0.57 (ref. range 0.35 - 4.0), t3 - 83 (ref. range 58-159), ft4 - <0.4 (ref. range 0.81-1.48). In 2009, my tsh and ft4 only were tested - tsh - 0.56, ft4 <0.4. The only thing it says on the labs is t3 - so I don't know if it was a more specific test. I changed gen. dr. because I am tired of feeling like crud and figure there must be a real problem somewhere. So far the only thing that has come up is anemia. Can that make all the numbers off a bit? For 5 years now, I usually get referred to psych if I come in w/ complaints.
I really appreciate you looking at my numbers and giving your thoughts. I am stymied. I just want to feel better and enjoy life!
Helpful - 0
393685 tn?1425812522
I don't udnerstand your post.. You are not officially diagnosed hypothyroid - but you take Cytomel only?

Who prescribed that to you? and for what then?

On your testing - none of that makes sense.

<4 on FT4? - that is concerning

Is your T3 lab a Free T3? even not, normal isn't normal - just b/c its in-between the reference. I bet this is a TT3 test and really - your high - so you are storing your T3 hormone and not releasing it.

In the past did you test a RT3 and that's how you were put on T3 medication?



Helpful - 0
231441 tn?1333892766
Hi,

I think the low FT4 is because you are taking a T3 only med.  Few people take a T3 only med, most take a combination of T3 and T4 meds, or just a T4 med.

Your doctor may change you to a T4 med or a combo med.

Let us know what he says.
Helpful - 0

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