...a test to measure the amount of TSH in your system will usually show lower than normal TSH when the thyroid is overactive (hyperthyroidism).
...some practitioners feel that relying solely on TSH -- a pituitary hormone -- without also evaluating the circulating levels of actual thyroid hormones T4 and T3 -- may not be able to detect more subtle thyroid problems... some practitioners also include other valuable blood tests, including T4, T3, Free T4, Free T3, Reverse T3, and antibodies tests.
As of 2008, the normal reference range is approximately 0.5 to 5.0. So levels below 0.5 are considered possible evidence of hyperthyroidism, and levels above 5.0 would be considered possible evidence of hypothyroidism... as of late 2002, some endocrinologists believed that the range should be narrowed significantly, to 0.3 to 3.0.
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