Thyroid function can be affected by many factors, including nutritional deficiencies and environmental exposure to certain elements. This profile is designed to help evaluate elemental exposure and thyroid hormone synthesis. Tests in this profile include Dried Urine: Iodine, Bromine, Selenium, Arsenic, Cadmium, Mercury, Creatinine; and Blood Spot: Total T4, Thyroglobulin, TSH, free T3, free T4, TPO.