The lab ranges vary, the test values vary depending on the
lab range (unlike TSH
tests), and the sweet spot is much narrower than the total range.
On the right side of this page, toward the top, is a heading that says "health pages". Click on that, and you can learn all about Hashimoto's, about tests and what they mean, and about acronyms that pertain to thyroid disease.
There is a lot to learn, and it will lead to many questions that you are welcome to discuss here.