Frequently asked question: What is a TRH test?

TRH is a hormone that is produced by the hypothalamus (a gland/organ in the brain). TRH ensures that the pituitary produces TSH. In a TRH test, TRH is injected into your blood with an IV. After three hours, a few blood samples are taken. These blood samples are analyzed to see precisely how much TSH is in your blood at that moment. This shows how well the pituitary is working. Purpose: to detect abnormalities in the control of the thyroid gland.

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