Less than 1 T4 reading

[Numberone1]

What kind of thing will I experience by having T4 less than 0.3.

I am on T3 only which therefore means a low T4 can be expected but I am shocked how low it is and worried that it could cause problems.

Any advice please?

[ivy77]

what symptoms do you have now?

[shaws Administrator]

If you are on T3 only, you will have very little T4 as your thyroid gland isn't producing any and you are not supplementing. With T3 only you have a high T3 and low TSH. Excerpt

For someone taking 100 mcg of T3, we expect your pattern of lab results—a low TSH and high T3. However, your TSH and T3 levels are irrelevant to whether you're overstimulated or not. Two studies we just completed confirm other researchers findings: these tests are not reliable gauges of a patient's metabolic status. Many patients taking T3 have TSH and T3 levels like yours but still have severely low metabolic rates. Their metabolic rates become normal only when they increase their dosages further. Their metabolic rates become normal and they have no detectable overstimulation.

web.archive.org/web/2010103...

[Hidden]

How do you feel? That's the main thing.

Does adding T4 not suit you?

[greygoose]

Hi, I'm on T3 only and my FT4 is zero. And I feel better without it! I'm on T3 only because I couldn't take any form of T4.

As far as anyone knows at this time, T4 is just a storage hormone that has to be converted into T3 that the body uses. As far as we know, it doesn't have an other purpose so it is unlikely that your low FT4 reading will cause you any problems. However, if you have the impression that it does, can you not just add in a little T4 to see if it makes you feel better?

Hugs, Grey