0.5 - 5.0
In general, people with no known thyroid conditions will have TSH values between 0.
5 and 5.0. Each lab determines its own normal range, and the lower limit can range from 0.2 - 0.6, and the upper limit from 2.5 to 6.0. There are some doctors who feel that the upper limit of normal is too high and that treatment should be considered for anyone with symptoms and TSH over 2.5 to 3.0.