TSH is a hormone that is sent from the piruitary gland in the brain to the thyroid, its acts like a sensor, when the thyroid hormone is low, the
Thyroid Stimulating Hormone number (TSH) is high,
and in reverse, if the Free
T3 is high, the TSH is low, the tsh nudges the thyoid to produce more
If you can get your MD to do these two tests, then when the results are in, request a copy, then post each levels and the reference ranges provided with them.