Thyroid-stimulating Hormone (TSH)

What is Thyroid-stimulating Hormone?

A thyroid-stimulating hormone (TSH) test measures the amount of TSH in the blood. It is produced by the pituitary gland, which is located at the base of your brain. It’s responsible for regulating the amount of hormones released by the thyroid.

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Why do you need to take this test?

You may need a TSH test if you have symptoms of too much thyroid hormone in your blood (hyperthyroidism), or too little thyroid hormone (hypothyroidism).

Results

High TSH levels can mean your thyroid is not making enough thyroid hormones, a condition called hypothyroidism. Low TSH levels can mean your thyroid is making too much of the hormones, a condition called hyperthyroidism. A TSH test does not explain why TSH levels are too high or too low. If your test results are abnormal, your health care provider will probably order additional tests to determine the cause of your thyroid problem. These tests may include:

  • T4 thyroid hormone tests
  • T3 thyroid hormone tests
  • Tests to diagnose Graves’ disease, an autoimmune disease that causes hyperthyroidism
  • Tests to diagnose Hashimoto’s thyroiditis, an autoimmune disease that causes hypothyroidism

Any questions? Please don’t hesitate to contact us. We will do our best to help you.