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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 …
Triiodothyronine (T3) Test: What It Is, Function & Levels
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 …
Thyroid Function Tests | American Thyroid Association
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 …
T3 levels: What is normal and what the test results mean
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.
Thyroid hormones - Wikipedia
The thyroid system of the thyroid hormones T 3 and T 4[1] Thyroid hormones are two hormones produced and released by the thyroid gland, triiodothyronine (T 3) and thyroxine (T 4). They are …
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T3 Thyroid Hormone: What Your Doctor Isn’t Telling You
Dec 17, 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 Tests: T3 Uptake Levels, Common Thyroid Conditions, and More - 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.