When my own thyroid meds are low, I am lethargic and confused.
When Red's thyroid was low and the other family wasn't treating him, he was lethargic and seemed confused. He had one number that didn't even hit the bottom of the range. All the symptoms were there though.
The numbers also depend on the lab.
Adding: When Red turned 9, the range changed and so did his dosage because he was considered a senior. I was not sure that I liked changing his range just because of a number, so I decided I would ait it out on the new lower dose. He seems fine