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Thyroxine, also known as T 4, is a hormone produced by the thyroid gland.It is the primary form of thyroid hormone found in the blood and acts as a prohormone of the more active thyroid hormone, triiodothyronine (T 3). [1]
Levothyroxine is a synthetic form of thyroxine (T 4), which is secreted by the thyroid gland. Levothyroxine and thyroxine are chemically identical: natural thyroxine is also in the "levo" chiral form, the difference is only in terminological preference. T 4 is biosynthesized from tyrosine. Approximately 5% of the US population suffers from over ...
In 2020, levothyroxine, a manufactured form of thyroxine, was the second most commonly prescribed medication in the United States, with more than 98 million prescriptions. [9] [10] Levothyroxine is on the World Health Organization's List of Essential Medicines. [11]
The sum activity of peripheral deiodinases (G D, also referred to as deiodination capacity, total deiodinase activity or, if calculated from levels of thyroid hormones, as SPINA-GD [a]) is the maximum amount of triiodothyronine produced per time-unit under conditions of substrate saturation. [1]
107585 Ensembl ENSG00000197406 ENSMUSG00000075707 UniProt P55073 Q91ZI8 RefSeq (mRNA) NM_001362 NM_172119 RefSeq (protein) NP_001353 NP_742117 Location (UCSC) Chr 14: 101.56 – 101.56 Mb Chr 12: 110.25 – 110.25 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Thyroxine 5-deiodinase also known as type III iodothyronine deiodinase (EC number 1.21.99.3) is an enzyme that in humans is ...
Blood free thyroxine and TSH levels are monitored to help determine whether the dose is adequate. This is done 4–8 weeks after the start of treatment or a change in levothyroxine dose. Once the adequate replacement dose has been established, the tests can be repeated after 6 and then 12 months, unless there is a change in symptoms. [8]