Why do I need a T3 (triiodothyronine) test? Healthcare providers most often order T3 tests to help diagnose hyperthyroidism, a condition in which your thyroid makes too much thyroid hormone, or to determine the severity of hyperthyroidism.

Jul 22, 2020 · Triiodothyronine, or T3, is an important thyroid hormone that helps maintain muscle control, brain function and development, heart and digestive functions. High or low T3 levels may indicate an...

May 28, 2023 · Doctors can determine the health of your thyroid by performing a T3 test. If you have received an abnormal thyroid-stimulating hormone (TSH) test result, a T3 test is likely used as the...

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 at the base of your throat. It makes two hormones, T3 and T4 (thyroxine).

Oct 2, 2023 · The T3 blood test (free triiodothyronine test) measures how much free T3 is in your blood to help diagnose thyroid conditions like hyperthyroidism. Learn more.

Sep 5, 2023 · Patients who are hyperthyroid will have an elevated T3 level. In some individuals with a low TSH, only the T3 is elevated and the FT4 or FTI is normal. T3 testing rarely is helpful in the hypothyroid patient, since it is the last test to become abnormal.

Oct 11, 2024 · Thyroid function is commonly assessed through thyroid-stimulating hormone (TSH) testing, as TSH is widely considered the most accurate biomarker for screening thyroid health. Elevated or suppressed TSH levels can signal potential thyroid dysfunction, such as hypothyroidism or hyperthyroidism.

Sep 19, 2019 · A T3 test is a blood test that helps your doctor determine if you have a thyroid problem. Learn why it’s used, how to prepare, and how to interpret results.

Feb 28, 2024 · Triiodothyronine (T3) is a thyroid hormone. It plays an important role in the body's control of metabolism (the many processes that control the rate of activity in cells and tissues). A laboratory test can be done to measure the amount of T3 …

Specifically, the T3 test can help doctors diagnose hyperthyroidism. This is a condition in which your thyroid makes too much T4 hormone. Hyperthyroidism causes symptoms like: Doctors don’t usually order the T3 test if they suspect hypothyroidism, or an underactive thyroid. Other tests can better spot this thyroid issue.