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Thyroid Hormone Tests. Guide. Thyroid hormone tests are blood tests that check how well the thyroid gland is working. The thyroid gland makes hormones that regulate the way the body uses energy. The thyroid gland is a butterfly-shaped gland that lies in front of your windpipe (trachea), just below your voice box (larynx).
Thyroid Blood Tests. The thyroid is a gland located in the neck. Itâs job is to take iodine from the blood and combine it with an amino acid (one of the building blocks of protein) to form thyroid hormones. One of the hormones, thyroxine, is responsible for your metabolism. This test may be measured any time of the day without fasting. 2  The brain regulates the amount of thyroid hormones in the blood. 3  When the hormone levels are low, the brain sends a message to send out TSH. 4  This causes the thyroid gland to send out more hormones.