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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, …

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 …

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, 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 …

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 …

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 …

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 …

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.