When are Thyroid Function Tests Performed and What do they look at?
When thyroid problems are suspected, doctors will usually perform a variety of thyroid function tests in order to determine exactly what the problem is and where it’s coming from. The first test these days is usually for TSH levels. High levels of TSH generally point to an inadequate production of hormones by the thyroid gland, while abnormally low TSH levels point to excessive hormone production by the thyroid. If the TSH is abnormal, the next test performed will usually be for overall T3 and T4 levels in order to confirm the problem. The biggest problems that a thyroid function test panel looks for are hypothyroidism, hyperthyroidism, cancer, or a problem with the pitutitary gland or the hypothalamus. Usually these tests are only done when symptoms of thyroid problems come up, but some medications have been linked to thyroid disease, including amiodarone, lithium salts, and some varieties of interferon. Therefore, if you’re on one of these medications, don’t be surprised when your do
