TPO antibodies affect embryo quality in euthyroid women with low-normal TSH≤2.5 μIU/mL. In women with high-normal TSH levels, increasing TSH levels, and possibly TPO antibodies, appear to impair embryo quality. These results suggest that the negative impact of thyroid autoimmunity becomes apparent, once thyroid hormone function is optimized.
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Weghofer et al. (2015) studied this question.
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