Reverse T3
This test measures the level of Reverse T3, a metabolite of Thyroxine (T4). Reverse T3 is the inactive form of Triiothyronine (T3) and may inhibit the action of the T3 hormone. RT3 levels alone may not be indicative of a thyroid condition, so this test may be ordered with other thyroid hormones such as TSH, T4 and T3.
Under normal conditions, the body converts T4 to T3 and RT3 in specific ratios. In certain circumstances, the amount converted to RT3 rises, such as when the body is under stress, as in cases of serious or acute illness or physical injury. Increased levels of RT3 have been noticed in severe trauma, severe infection, starvation, anorexia, as well as after surgery.
Test results typically take 4-6 business days once the specimen is received at the laboratory. *Please note as of 4/19/22, the timeframe for results may take 12-16 business days due to the pandemic.
Choose the test you want (be sure to pick the laboratory you want to use).
Pay by credit card or PayPal®.
You pay directly and we do not bill your insurance.
After purchasing your testing you will receive an email with your lab requisition. Bring this form to the laboratory.
If you have selected the option to have an At Home Test Kit delivered to you, you will receive your test kit in the mail within 5 to 7 business days. (Not all tests are available as At Home Test Kits.)
We’ll email you when your results are ready. Sign into your account to view and download your result reports.
Certain result values may prompt a phone call from our ordering provider to ensure the patient is aware of their result.
Associated Categories
Frequently Ordered Together
Measures the amount of thyroid-stimulating hormone TSH, Free T3, Free T4, T3 Uptake, T4, T7, T3 Total and Thyroid Peroxidase Antibody (TPO).
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