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What is a triiodothyronine (T3) test? A triiodothyronine (T3) test measures the level of T3 in a sample of your blood. It's used to help diagnose thyroid disease. Your thyroid is a small, butterfly-shaped gland …

Feb 14, 2022 · Triiodothyronine, also known as T3, is one of the two main hormones your thyroid gland releases into your bloodstream. Your thyroid also produces thyroxine, also known as T4 and …

Sep 5, 2023 · The major thyroid hormone secreted by the thyroid gland is thyroxine, also called T4 because it contains four iodine atoms. To exert its effects, T4 is converted to triiodothyronine (T3) by …

Triiodothyronine, also known as T3, is a thyroid hormone. It affects almost every physiological process in the body, including growth and development, metabolism, body temperature, and heart rate.

Jul 24, 2025 · There are two forms of T3: free and bound. Most of the T3 in your blood is attached, or bound, to proteins, and only a small percentage of it is free. A total T3 test measures both bound and...

Dec 26, 2025 · In fact, about 20% of the total amount of hormone that your thyroid produces is T3 (1). This hormone influences almost every cell in your body, through nuclear receptors, and can be …

Jun 10, 2025 · Triiodothyronine (T3) is a hormone produced by the thyroid, a small gland that sits just below the Adam’s apple on the front of the neck. T3 regulates several vital functions in the body. So …

Jul 22, 2020 · High or low T3 levels might indicate that a person has a thyroid condition. Learn about the normal ranges and what the results mean.