Hypothyroidism is diagnosed based on your symptoms and the results of blood tests that detect TSH and, in some cases, thyroxine, the thyroid hormone. An underactive thyroid is indicated by a low thyroxine level and a high TSH level. This is because your pituitary gland creates more TSH to encourage your thyroid gland to make more thyroid hormone. Thyroid diseases can now be diagnosed far earlier than in the past, frequently before symptoms appear. Our doctor will most likely check TSH first, then a thyroid hormone test if necessary, because TSH is the best screening test. For more details please contact us! 9971473354