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Can adding some T3 to Mostly T4 (NDT or thyroxine) clear rT3 (reverse T3)?

By Paul on Thu, 19/03/2015 - 13:07

I was recently asked by a friend whether it was true that by adding some T3 medication to their main thyroid medication of natural desiccated thyroid (NDT) or thyroxine (T4) that this would clear reverse T3 (rT3).

The answer to this is very simple. No, it won't clear rT3 if someone just adds some T3 to NDT or T4 medication - the basic science is very straightforward.

Let me explain.

Hungry for Sherbet Lemons?

By Paul on Sun, 23/09/2012 - 10:22

I've seen or heard many times viewpoints expressed that suggest that there are ideal levels of FT4 and FT3. Whether someone can deal with levels of FT4 and FT3 that would fit with these ideas of good health depends on several factors.

Thyroid Blood Tests Part 6 - Can Everyone Rely on FT4, FT3 and rT3 Blood Tests During Treatment?

By Paul on Sat, 04/02/2012 - 18:19

My last blog was about reverse T3 and my view that the dynamic nature of rT3 and the unreliability of all thyroid hormone blood tests makes depending on reverse T3 or FT3/rT3 ratio as a guide to thyroid hormone treatment a risky proposition for some people.

Thyroid Blood Tests Part 5 - What is Reverse T3?

By Paul on Thu, 02/02/2012 - 17:45

T4 is a metabolically inactive hormone. It only becomes useful to the body after an enzyme called 5’-deiodinase converts it into the active hormone, T3. A different enzyme, 5-deiodinase, is able to convert some of the T4 into reverse T3 (often shortened to rT3).

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