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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).
Blood Test for Thyroid. 1. Free T4. T4 and T3 are the two main thyroid hormones. But, T4 is the less active hormone. Your body converts much of your T4 into the more active T3 inside the cells of your body. With the T4 (and T3) test you can check both free and total levels. You want to be sure your doctor is checking the free levels.