Thyroid-Stimulating Hormone (TSH)
|Why is this test done?||TSH is measured as part of thyroid disorder diagnosis and management.|
|How to prepare:||
|Target Values*:||Adults: 0.3 - 5.0 mU/L|
|Associated Tests:||In addition to TSH, biochemical tests done to explore the thyroid function include thyroid hormones, thyroglobulin and antithyroid antibody levels.|
The aptly named thyroid-stimulating hormone stimulates the thyroid gland. It is secreted by the hypophysis, a gland located in the brain. Upon its release in the blood, it causes the thyroid gland to produce and release the thyroid hormones, which play multiple roles in the body such as regulating the metabolism and growth.
What does an abnormal test result mean?
If the result is too high
Reduced thyroid activity (hypothyroidism) will increase TSH levels.
If the result is too low
Increased thyroid activity (hyperthyroidism) will decrease TSH levels.
Hypophysis or hypothalamus (another gland located in the brain) disorders can either increase or decrease TSH levels depending on their nature.
Factors that can affect the result of the test
Certain medical tests (radioisotope testing), pregnancy, extreme stress and acute illness can affect results. Taking certain drugs, can too:
What you need to know before the test
Before going for blood tests, a procedure or other exam, it is best to always bring a list of all the drugs you take (prescription, OTC and natural health products). Unless told otherwise, you should take your medication as usual on the day of the test. When in doubt, ask your pharmacist for more information.
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The patient information leaflets are provided by Vigilance Santé Inc. This content is for information purposes only and does not in any manner whatsoever replace the opinion or advice of your health care professional. Always consult a health care professional before making a decision about your medication or treatment.