Thyroxine

Thyroxine: Abbreviated T4. A hormone made by the thyroid gland that has four iodine molecules attached to its molecular structure. T4 and other thyroid hormones help regulate growth and control the rate of chemical reactions (metabolism) in the body.
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Alternate Names
: Thyroxine Test
Definition
A test that measures the amount of T4 in the blood.
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Thyroxine (T4). Hypothyroidism is a condition marked by low thyroxine (T4) hormone levels and they are usually measured. However, the findings from this test are usually inadequate for the following reasons: ...
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Thyroxine (T4) is produced by your thyroid gland when the pituitary gland releases thyroid-stimulating hormone.
Only a small amount of triiodothyronine (T3) is produced directly by your thyroid gland.
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Thyroxine is used in the treatment of an underactive thyroid gland. This article discusses how it is used and its possible side effects.
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Thyroxine (T)
Thyroid hormone that regulates many essential body processes.
Resources: ...
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levothyroxine Oral levothyroxine drugs have been marketed in the United States since the 1950s; however, ...
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A lack of thyroxine, the hormone from the thyroid, results in a slowing of physical and mental functions. Hyperthyroidism is related to emotional disturbance, forgetfulness, slow thought processes, and irritability.
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The rate at which thyroxine and triiodothyronine are released is controlled by your pituitary gland and your hypothalamus — an area at the base of your brain that acts as a thermostat for your whole system.
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absence of the thyroid, presence of only a rudimentary gland, inability of the gland to produce thyroxine). However, it can develop later if there is a lack of iodine in the diet, or if the thyroid is diseased or surgically removed.
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However, a significant sign that the infant may have hypothyroidism are low T4 (thyroxine, a hormone secreted by the thyroid gland which regulates metabolism) levels and high TSH (thyroid-stimulating hormone, ...
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- thyroxine (T4) test
Hyperventilation syndrome
Hypocalcemia
Hypoglycemia, insulin-reaction * -
Hypothermia
Hypothyroidism
- diagnosis and treatment
- diagnosis and treatment, brief version *
- thyroid-stimulating hormone (TSH) test ...
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Follicular cells in the thyroid produce a hormone called thyroxine, or T-4, which controls the body's rate of metabolism.
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Hypothyroidism is easily treated by using replacement thyroid hormone, called thyroxine. This can be taken as tablets but must be taken for life. The dose needs to be regularly checked and occasionally needs to be adjusted.
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The ideal thyroxine replacement dose during pregnancy may rise by 25-50% during pregnancy. It is important to have regular checks of T4 and TSH during pregnancy to make sure you are at the correct medication dose.
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Congenital nephropathy can disturb thyroid activity, so the child may need a substitute hormone, thyroxine, to promote growth and help bones mature. A blood thinner like warfarin may be necessary to keep the child's blood from clotting.
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THYROID: An endocrine gland that produces hormones, including thyroxine and triiodothyronine.
TINNITUS: Noises (eg, ringing, roaring, whistling) in the ears.
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The most important of these hormones is thyroxine (T4), which accounts for 99.9 percent of the thyroid hormones in the blood. Another hormone, tri-odothyronine (T3), accounts for the other 0.1 percent.
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Thyroid-stimulating hormone suppression with thyroxine is also effective in many lesions not sensitive to I131.
Patients unresponsive to I131 should also be considered candidates for clinical trials testing new approaches to this disease.
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Such groups would include those involved in long term corticosteroid or thyroxine users, early hysterectomy or oophorectomy patients, patients with coronary artery disease, diabetics and familial hyperlipidaemia cases.
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