Thyroid hormone, as the name suggests, is a hormone produced by the thyroid gland. People who have growth retardation or metabolic disorders can have their thyroid hormones tested. The cost of a thyroid hormone test is around $200-300. Each hospital is at a different level and therefore charges different rates, so there will be some variation in price and it is impossible to be completely uniform. Thyroid hormone is an amino acid derivative that has a very important role in promoting metabolism and development, increasing the excitability of the nervous system, respiration, accelerated heart rate, and increased heat production. Thyroid hormone is very important to the human body, as it works synergistically with growth hormone to promote growth and development, and with adrenaline to regulate body temperature. As long as you have not taken any medication in the recent past, you can have your blood drawn and the cost is not very different. Children with symptoms such as growth retardation or mental retardation are recommended to have their thyroid hormones checked by a blood test at a hospital.