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neonem
I don't understand the last part of this question stem though... if the mother's TSH *increases* during pregnancy? Wouldn't this further increase her (and/or the fetus's) production of T4 and thus counteract the hypothyroidism?
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poojaym
@neonem no. Autoimmune hypothyroidism is a destruction of the thyroid gland, and a decrease in production of T3/T4.
An increase in TSH means that there is not enough T3/T4 to inhibit TRH, and so TSH is being released to stimulate the thyroid gland.
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arezpr
TSH, T3, T4 and thyroglobulin cannot cross the placental barrier.
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chamaleo
@arezpr although those hormones can't cross, the autoantibodies from Hashimoto's can
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sbryant6
TSH comes from the pituitary, and act on the thyroid. Autoantibodies attack the thyroid, so TSH doesn't work.
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lola915
I think there is no goiter because the baby's thyroid gland has not fully developed and these immunogloblulins from the mother could attack the thyroid gland leading to issues with it's development.
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Autoimmune thyroiditis (aka Hashimoto) + pregnant--> Think about possibility of fetal hypothyroidism due to antibody mediated maternal hypothyroidism. Leads to Cretinism. Findings in infant are the 6'P (Pot belly, Pale, Puffy face, Protruding umbilicus, Protuberant tongue, and Poor Brain development.