Search results
Results from the WOW.Com Content Network
The results came from a small study comprising 81 participants who had typical thyrotropin levels, which are used to indicate thyroid function, and who were taking levothyroxine.
Thyroid function tests (TFTs) is a collective term for blood tests used to check the function of the thyroid. [1] TFTs may be requested if a patient is thought to suffer from hyperthyroidism (overactive thyroid) or hypothyroidism (underactive thyroid), or to monitor the effectiveness of either thyroid-suppression or hormone replacement therapy.
In 1971, the thyroid stimulating hormone (TSH) radioimmunoassay was developed, which was the most specific marker for assessing thyroid status in patients. [82] Many people who were being treated based on basal metabolic rate, minimizing hypothyroid symptoms, or based on serum protein-bound iodine, were found to have excessive thyroid hormone. [82]
Negative correlation of Jostel's TSH index to the urinary excretion of certain phthalates suggests that endocrine disruptors may affect the central set point of thyroid homeostasis. [28] Drugs that reduce the TSH index, probably via effects on the central set point of the feedback loop, include mirtazapine [29] and oxcarbazepine. [30]
Thyroid-stimulating hormone (also known as thyrotropin, thyrotropic hormone, or abbreviated TSH) is a pituitary hormone that stimulates the thyroid gland to produce thyroxine (T 4), and then triiodothyronine (T 3) which stimulates the metabolism of almost every tissue in the body. [1]
When pregnant, a woman with a low-functioning thyroid will also need to increase her dosage of thyroid hormone. [16] One exception is that thyroid hormones may aggravate heart conditions, especially in older patients; therefore, doctors may start these patients on a lower dose and work up to a larger one to avoid risk of heart attack.
The pituitary gland secretes thyrotropin (TSH; Thyroid Stimulating Hormone) that stimulates the thyroid to secrete thyroxine (T4) and, to a lesser degree, triiodothyronine (T3). The major portion of T3, however, is produced in peripheral organs, e.g. liver, adipose tissue, glia and skeletal muscle by deiodination from circulating T4.
Dosing should be based on regular measurements of thyroid-stimulating hormone (TSH) and T 4 levels in the blood. [5] Much of the effect of levothyroxine is following its conversion to triiodothyronine (T 3). [5] Levothyroxine was first made in 1927. [8] It is on the World Health Organization's List of Essential Medicines. [9]