Thyroxine is referred to as T4 since it includes four iodine atoms

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Thyroxine is referred to as T4 since it includes four iodine atoms
Thyroxine is called T4 because it contains four iodine atoms

Read more: http://t3andt4.com
are shortened references to two really crucial hormones that are made by the thyroid gland to regulate the body's metabolic rate. If you have a thyroid problem, you could have observed T3 and T4 scratched in your doctor's notes or on the lab sheet you current when you get your blood drawn. You may well want to get a closer search at what these hormones are and why they are crucial