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Reverse T3 Blood Test
Item # LC070104
Tests for a nonfunctioning form of the active hormone T3
Reverse T3 Blood Test
Item # LC070104
Tests for a nonfunctioning form of the active hormone T3
Testing for blood levels of reverse T3, a nonfunctioning form of T3, can be informative for people experiencing symptoms of hypothyroidism, which can be associated with high reverse T3 levels.
| Reverse T3 is a non-functioning form of the active hormone triiodothyronine (T3). In the tissues, T4 normally converts to T3. However, other hormones such as cortisol may inhibit this conversion, producing reverse T3 (rT3). Having high levels of reverse T3 is known as thyroid resistance and produces symptoms of low thyroid function (hypothyroidism). If you suffer from symptoms such as fatigue, weight gain, dry skin or hair loss and your traditional thyroid lab results are inconclusive, you might consider checking your reverse T3 level. Instructions Fasting is not required for this test. Take all medications as prescribed. Note For a more extensive evaluation of thyroid function, Life Extension® offers a Comprehensive Thyroid Panel. |
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Comprehensive Thyroid Panel Blood Test
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