1. Glossary
  2. FT3 (free T3 thyroid hormone)

FT3 (free T3 thyroid hormone)

FT3, or free T3 thyroid hormone, is a vital component of the body’s endocrine system. It is one of the primary hormones produced by the thyroid gland, which is found at the front of the neck. FT3 plays a crucial role in regulating metabolism, which is the process that converts food into energy. This energy is essential for maintaining body temperature, heart rate, and bodily functions.

Unlike total T3, FT3 refers to the fraction of the hormone that is not bound to proteins in the blood and can easily enter cells to exert its effects. Free T3 is more active and readily available for the body's needs. Doctors often measure FT3 when diagnosing or managing thyroid-related disorders such as hyperthyroidism or hypothyroidism.

An imbalance in FT3 levels can lead to symptoms like fatigue, weight changes, and mood swings, which can significantly affect a person’s well-being. Monitoring FT3 levels can provide valuable insights into a patient's thyroid health and overall metabolic function, guiding appropriate medical treatment.

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