what is it and what does it do?
T3, or triiodothyronine, is one of the two main hormones released by your thyroid gland into your bloodstream. Thyroxine, also known as T4 and tetraiodothyronine, is produced by your thyroid. T4 and T3 work in tandem and are collectively referred to as "thyroid hormone."
The majority of the T3 in your blood (approximately 80%) comes from your body's conversion of T4 to T3 outside of your thyroid gland. Your thyroid gland produces the remainder of the T3 in your bloodstream.
Hormones are chemicals that help your body coordinate different functions by transporting messages through your blood to your organs, muscles, and other tissues. These signals instruct your body on what to do and when.
T3 is the active form of thyroid hormone, which means it affects cells in your body, whereas T4 is the inactive form. The majority of the T4 produced by your thyroid is converted to T3 by your liver and kidneys.
What is the purpose of a T3 (triiodothyronine) test?
T3 tests are typically ordered by doctors to help diagnose hyperthyroidism, a condition in which your thyroid produces too much thyroid hormone, or to determine the severity of hyperthyroidism.
If you're taking thyroid hormone replacement therapy (medication) for a thyroid condition, your provider may order regular T3 tests to monitor your T3 levels.
What can I expect following my T3 (triiodothyronine) test?
Your blood sample will be sent to a laboratory for testing after it has been collected by a healthcare provider. When the test results are available, your provider will notify you.
What kind of T3 (triiodothyronine) test results can you expect?
Blood test results, including T3 test results, typically include the following data:
What was measured in your blood or the name of the blood test.
Your blood test result's number or measurement.
That test's normal measurement range.
Information indicating whether your result is normal, abnormal, high, or low.
The results of total T3 tests are usually accurate. Certain medications or supplements, as well as pregnancy, may, however, interfere with the results. When interpreting your results, your healthcare provider will take these factors into account
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