T3 Reverse Test
T3 Reverse Test FAQ
What is Reverse T3?
What is a Reverse T3 Test?
What type of specimen will I submit?
Do I need to fast to take this test?
How long does it take to get test results?
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rT3 Blood Test - More Information
The reverse T3 test, sometimes known as rT3 or reverse triiodothyronine, is a blood test that measures the reverse T3 level. Reverse T3 is a less common form of T3, a hormone produced by the thyroid gland.
Reverse T3 is a hormone produced from the metabolism of T4, or thyroxine. There is some controversy within the medical community as to whether reverse T3 is of value as an adjunct to standard hypothyroidism testing. In particular, many functional medicine practitioners believe that elevated reverse T3 levels result from chronic stress in the body and, consequently, on the thyroid gland. In these situations, an elevated reverse T3 level may represent a form of hypothyroidism that is not identifiable by T4 or TSH testing, particularly when symptoms are present.
The T3 reverse test can be performed with a simple blood draw at a Quest Diagnostics lab near you. Once your T3 lab report is available, it can be downloaded. As can be seen on the sample reverse T3 lab report, the results will be reported as a number and can be compared against the reference range provided by the lab.
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