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Health Library : High-Risk Pregnancy

 

Thyroid Conditions

The thyroid gland is located in the front of the neck, below the larynx (voice box). The small, two-inch gland consists of two lobes, one on each side of the windpipe, connected by tissue called the isthmus.

The thyroid tissue is made up of two types of cells: follicular cells and parafollicular cells. Most of the thyroid tissue consists of the follicular cells, which secrete iodine-containing hormones called thyroxine (T4) and triiodothyronine (T3). The parafollicular cells secrete the hormone calcitonin. The thyroid needs iodine to produce the hormones.

The thyroid plays an important role in regulating the body's metabolism and calcium balance. It also plays a role in fertility, growth, and skin maintenance. The T4 and T3 hormones stimulate every tissue in the body to produce proteins and increase the amount of oxygen used by cells. The harder the cells work, the harder the organs work. The calcitonin hormone works together with the parathyroid hormone to regulate calcium levels in the body.

Levels of hormones secreted by the thyroid are controlled by the pituitary gland's thyroid-stimulating hormone, which in turn is controlled by the hypothalamus.

Thyroid conditions can affect a pregnancy and require clinical care by a physician or other health care professional. Listed below are some specific thyroid problems, for which we have provided a brief overview.

If you cannot find the information in which you are interested, please visit the High-Risk Pregnancy Online Resources page in this website for an Internet address that may contain additional information on that topic.


 Sources & References

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 Find an MUSC Doctor:
 »Endocrinology
 »OB/GYN - Maternal-Fetal Medicine
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