Triiodothyronine (T3)

Definition - What does Triiodothyronine (T3) mean?

Triiodothyronine (T3) is a hormone that helps the body regulate many different functions. The hormone is produced by the thyroid gland, and through the conversion of another hormone, thyroxine (T4) into T3 by the liver and kidneys. Because the thyroxine used for conversion to T3 is also secreted by the thyroid gland, measuring a person's T3 levels allows medical professionals to assess his or her overall thyroid health.

WorkplaceTesting explains Triiodothyronine (T3)

The hormone triiodothyronine (T3) plays an important role in the body's maintenance and control of metabolism, heart function, digestion, neurological development, muscle control and bone health. Abnormal T3 levels may be an indication of a thyroid or pituitary condition, liver disease, or autoimmune disease. Individuals with abnormal T3 levels may experience symptoms including muscle weaknesses, anxiety, hair loss, unusually weigh changes, a rapid heart rate, hand tremors, or difficulty sleeping.

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