The Ultrasensitive TSH also known as Ultrasensitive Thyroid Stimulating Hormone Test is also known as TSH or Thyrotropin test. This test measures the levels of Thyroid Stimulating Hormone (TSH) in the blood. TSH is produced by the anterior part of pituitary gland and its function is to stimulate the thyroid gland. The Ultrasensitive Thyroid Stimulating Hormone (TSH), Serum test is done: • To diagnose disorders of thyroid gland • To monitor the treatment of disorders of thyroid gland • To screen newborns for congenital hypothyroidism • In cases of signs and symptoms of thyroid disorders such as enlarged thyroid or presence of thyroid nodule