Hypothyroidism is an endocrine disease characterized by a lower thyroid hormone level.

甲状腺激素血症为特点的内分泌疾病。

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Objective: To investigate the pregnancy early, middle and late stages of serum thyroid hormone level changes.

目的：探讨妊娠早、中、晚各期血清甲状腺激素水平的变化规律。

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MRTHODS:In this study, the thyroid hormone level was tested in 29 patients treated with phenytoin sodium only.

方法：测定29例单用苯妥英钠病人的血清甲状腺素。

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The higher the TSH level, the lower the level of thyroid hormone production.

WSJ: U.S. Track's Unconventional Physician