Thyroid UK
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Reverse T3 - Has anyone had a test for reverse T3 for it to come back as out of range?

Hi TUKs,

We have been asked for a fair few Reverse T3s over the last couple of years or so - but without looking through all of the results and going from memory I'm unsure if anyone has ever actually had a reverse t3 that is out of range. It's an expensive test relative to all of the others, but I know that it is well celebrated in the online thyroid community generally, maybe due to the technique/method . My question is has anyone ever had a RT3 result come in out of range? And has a RT3 result one way or the other ever come in useful in obtaining treatment?

9 Replies

I do not have a problem, but this is a link to Dr Lowe's archived website and his answer to a question may be helpful to you. He was also Director of Thyroid Science and Fibromyalgia Research Foundation. Cursor down to the last question on this page.


Interesting, Thank you.


I had a very high reverse T3 reading (nearly 50% higher than the top of the range) but it was not from a Blue Horizon test. I'm now treating myself with T3 only and I'm feeling better than I have done in many years. I'm still not on a stable dose but I'm getting there.

Edit : I should make clear that I'm self-medicating. I have never discussed Reverse T3 with my doctor, and I haven't (as yet) told her about self-medicating, although I intend to tell her soon.

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I had a normal FT3 test done by Blue Horizon a few weeks ago and am wondering that despite the fact I seem to be converting fine if it was the RT3 instead of FT3 that may have been misread.

I don't know anything about Reverse T3 at all I'm afraid but from what I've heard FT3 can be mistaken for RT3?


Jo xxx


Hi Jo,

Can you please email me - with your question and I'll look into this for you.



I manage my own health with ndt . I always get my rt3 tested when i get my own private bloods. Yes the results assist me in determining how best to manage my own health. When the nhs was still destroying my health, i took my results incl rt3 only to find nhs gp was clueless and i don't have time to educate. For me, rt3 completes the picture. On ndt it has always come back in range


Thank you for the information Bluedaffodil; It is good to know that RT3 is of use to you.


Hi Paul

Unrelated to the topic of rt3

I have just had an active B12 test carried out by BlueHorizonMedicals - I was concerned that I would not be able to collect all the blood required to fill the small container from a very small pin pick but following the instructions provided I managed this without any problems.

I am very impressed with the service and the comments received by your doctor on my results which were helpful.

Many thanks



Hi Tricia,

Glad to be of service. Also good to know that you managed to get enough blood for the home test for Active B12, it's not always that easy - I had a problem last week when demonstrating it to a colleague, but it was because I didn't follow instructions - typical man!!!


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