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Quick Answer. The TSH 3rd generation test is a diagnostic blood test that measures the amount of thyroid-stimulating hormone in the blood stream. The test is used to evaluate thyroid function and to determine if hypothyroidism or hyperthyroidism is present. Continue Reading.
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).hyroid hormone tests are done to: 1  Find out what is causing an abnormal thyroid-stimulating hormone (TSH) test. 2  Check how well treatment of thyroid disease is working. 3  Screen newborns to find out if the thyroid gland function is normal.