m sorry, my previous answer might have been confusing......... Once you have an autoimmune
disease, you have it for life; it
does not
go away, though it may go into remission.
Free T4 is converted to T3, mostly in the liver, though the conversion takes place in other parts of the body as well, plus the thyroid produces some T3. Some of us do not convert properly, therefore have to add a source of T3 to our regimen. That's why testing for Free T3 is so important.