Guest guest Posted October 7, 2003 Report Share Posted October 7, 2003 Hi Fay, This could be central hypothryoidism. After being hypo for some time, which could happen with an FT4 of 0.8 and/or a low FT3, the pituitary can also slow down its function. In central hypoT, either the hypothalamus or the pituitary loses its usual response to a low thryoid hormone level and TSH secretion slows down. This used to be considered rare but it's known to be fairly common. You test for it with a TRH test. Here thyrotropin (TSH) releasing hormone [TRH} is administered. It should cause a rise in TSH if the pituitary/hypothalmic/thyroid axis is functioning ok. if TSH doesn't rise in the 30 and 60 min tests post dose, one has central hypoT. Take care, Elaine Quote Link to comment Share on other sites More sharing options...
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