Transcription of Thyroid Function Tests
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Thyroid Function Tests
American Thyroid Association . Thyroid Function Tests What is the Thyroid gland? T4 and T3 circulate almost entirely bound to specific transport proteins, and there are some situations which The Thyroid gland is a butterfly-shaped endocrine gland these proteins could change their level in the blood, that is normally located in the lower front of the neck. producing also changes in the T4 and T3 levels (it The Thyroid 's job is to make Thyroid hormones, which are happens frequently during pregnancy, women who take secreted into the blood and then carried to every tissue control birth pills, etc). in the body.
Blood tests to measure these hormones are readily available and widely used, but not all are useful in all situations. Tests to evaluate thyroid function include the following: TSH TESTS The best way to initially test thyroid function is to measure the TSH level in a blood sample. Changes in TSH can serve as an “early warning system” – often
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