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Date: | Wed, 24 Dec 2003 13:14:45 +0800 |
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On 23/12/2003, at 16:27, Kermaline J. Cotterman wrote:
> And conversely, when the TSH result is low, it means the feedback to
> the
> pituitary indicates the level of thyroid is within normal limits, and
> therefore, no need to stimulate extra production.
Only if the pituitary gland is in good working order. A low TSH can
also mean that a person is experiencing pituitary failure (eg Sheehan's
syndrome), and in this situation the T4 would be expected to be low
also, rather than the high-T4, low-TSH situation in hyperthyroidism.
Hence using TSH as a lone thyroid function test is useless if there is
a possibility of pituitary hypofunction; you need the full thyroid
function tests.
Lara Hopkins
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