Is 2.1 what you meant to type? Or is that a typo? Please confirm.
If it really is 2.1, and your doctor says that's "in range", he's a moron. He didn't even order the best tests for diagnosis. These are total T4/T3 tests, and they're far less accurate than the important free T4/T3 levels, but they're low enough to suggest the free T4 and free T3 are probably deficient.
He also should have ordered TPO and Tg antibodies tests.