Transcription of Thyroid Function Tests
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Thyroid Function Tests
American Thyroid Association . Thyroid Function Tests What is the Thyroid gland? T4 and T3 circulate almost entirely bound to specific transport proteins, and there are some situations which The Thyroid gland is a butterfly-shaped endocrine gland these proteins could change their level in the blood, that is normally located in the lower front of the neck. producing also changes in the T4 and T3 levels (it The Thyroid 's job is to make Thyroid hormones, which are happens frequently during pregnancy, women who take secreted into the blood and then carried to every tissue control birth pills, etc). in the body. Thyroid hormone helps the body use energy, stay warm and keep the brain, heart, muscles, and other Another measurement done to assess the Thyroid status of organs working as they should. patients is the free T4 measurement. The free T4 avoids any change the proteins could have, giving us a more Function accurate value for the T4 level (see below).
T4 and T3 circulate almost entirely bound to specific transport proteins. If the levels of these transport proteins changes, there can be changes in how much bound T4 and T3 is measured. This frequently happens during pregnancy and with the use of birth control pills. The “free” T4 or T3 is the hormone that is unbound and able to enter
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