Here is a great new blog post from Professor Tania Sona Smith. It refers to important research which I have shared in other blog posts.
It shows how the loss of thyroid gland tissue is a game-changer. It shows why conventional thyroid labs that have been developed from testing healthy people are no longer applicable when you have a thyroid issue.
It discusses the importance of the thyroid gland itself to maintaining good T3 levels and helping the rest of he body to continue to convert T4 to T3 (by not lowering TSH in the way that thyroid treatment tends to do).