Triiodothyronine (T3) Test: What It Is, Function & Levels
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 tetraiodothyronine. …
Triiodothyronine - Wikipedia
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.
T3 Tests: T3 Uptake Levels, Common Thyroid Conditions ... - WebMD
Jul 24, 2025 · A T3 test measures the level of the thyroid hormone triiodothyronine (T3) in your blood. Your doctor uses it to check how well your thyroid works.
Triiodothyronine (T3) Tests: MedlinePlus Medical Test
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 …
T3 levels: What is normal and what the test results mean
Jul 22, 2020 · Triiodothyronine, or T3, is an important thyroid hormone that helps maintain muscle control, brain function and development, heart and digestive functions.
T3 Thyroid Hormone: What Your Doctor Isn’t Telling You
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 …
T3 Blood Test: Purpose, Symptoms, Normal Level & Hyperthyroidism
A T3 test examines thyroid function by measuring your blood level of the hormone T3 (triiodothyronine). Learn what symptoms lead up to a T3 test and what your results mean today.