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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.
NTIS as a result of fasting may be regarded as a healthy and adaptive mechanism that reduces energy expenditure. [10] Fasting in healthy, euthyroid people causes reduced T3 and elevated rT3, although TSH is usually unchanged. [3] [5] [10] Even moderate weight loss can lower T3. [2]
The TRH test involves administration of a small amount of TRH intravenously, [1] following which levels of TSH will be measured at several subsequent time points using samples of blood taken from a peripheral vein.
Desiccated thyroid extract (DTE), is thyroid gland that has been dried and powdered for medical use. [1] It is used to treat hypothyroidism, [1] but less preferred than levothyroxine. [1] It is taken by mouth. [1] Maximal effects may take up to three weeks to occur. [1] Side effects may occur from excessive doses. [1]
Thyroid disease is a medical condition that affects the function of the thyroid gland. The thyroid gland is located at the front of the neck and produces thyroid hormones [1] that travel through the blood to help regulate many other organs, meaning that it is an endocrine organ. These hormones normally act in the body to regulate energy use ...
This causes the production of thyroid hormones and subsequent growth and vascularisation of the thyroid. [1] TRAbs are also useful in the diagnosis of Graves' ophthalmopathy . Although the exact mechanism of how TRAbs induce Graves' ophthalmopathy is unknown, it is likely that the antibodies bind to TSH receptors in retro-orbital tissues ...
Therapeutic drug monitoring (TDM) is a branch of clinical chemistry and clinical pharmacology that specializes in the measurement of medication levels in blood.Its main focus is on drugs with a narrow therapeutic range, i.e. drugs that can easily be under- or overdosed. [1]
In thyroid cancer or Graves' disease, ablation therapy with radioactive iodine (131 I) can be used to remove trace thyroid tissue that may remain after thyroidectomy (surgical excision of the gland). For 131 I therapy to be effective, the trace thyroid tissue must be avid to iodine, which is achieved by elevating the person's TSH levels. [ 6 ]