Thyrotropin-Releasing Hormone Test
- TRF Test (Thyrotropin-Releasing Factor Test)
TRH is a hormone produced by the pituitary gland. TSH production is suppressed by high blood levels of T3 and T4. TRH levels are mainly used to diagnose an under-active pituitary gland, and to differentiate between depression and bipolar illness (manic-depressive). After being given a dose of TRH, people with normally functioning or over-active thyroid glands will not have increased blood levels of TSH. TRH levels can also be abnormal in elderly men, and during normal pregnancy.
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