Thyroid-stimulating Hormone

Reference range of Thyroid-stimulating Hormone is:

A high TSH result may mean that:

  • Some type of acute or chronic thyroid dysfunction, low responding adequately to the stimulation of TSH.
  • A person with hypothyroidism or the thyroid gland removed received too little thyroid hormone replacement medication and the dose may need to be adjusted.
  • A person with hyperthyroidism is receiving too much anti-thyroid medication and the dose needs adjusting.
  • There is a problem with the pituitary gland, such as a tumor producing unregulated levels of TSH.

A low TSH result may indicate:

  • An overactive thyroid gland (hyperthyroidism).
  • Excessive amounts of thyroid hormone medication in those who are being treated for an underactive (or removed) thyroid gland.
  • Insufficient anti-thyroid medication in a person being treated for hyperthyroidism; however, it may take a while for TSH production to resume after successful anti-thyroid treatment.

Whether high or low, an abnormal TSH indicates an excess or deficiency in the amount of thyroid hormone available to the body, but it does not indicate the reason why. An abnormal TSH test result is usually followed by additional testing to investigate the cause of the increase or decrease.

* The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.