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Reverse T3
Additional Information
Reverse triiodothyronine (rT3) is an isomer of triiodothyronine (T3) with no demonstrated biological activity.1,2 The majority of rT3is produced through peripheral enzymatic monodeiodination of T4 at the 5 position of the inner ring of the iodothyronine nucleus of thyroxine (T4). A lesser amount of rT3 is secreted directly by the thyroid gland. Reverse T3 is biologically inactive and does not stimulate thyroid hormone receptors.
$75.00
The Reverse T3 (rT3) test measures an inactive form of the thyroid hormone T3. While regular T3 helps regulate your metabolism and energy, Reverse T3 can block its effects. High levels may indicate that your body is under stress or not properly converting T4 into active T3.
This test can help evaluate:
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Persistent fatigue despite normal thyroid labs
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Thyroid hormone conversion issues
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Chronic stress or illness
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Unexplained weight changes
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Ongoing symptoms while on thyroid medication
Reverse T3 testing is often used alongside TSH, Free T4, and Free T3 for a more complete picture of thyroid function.
With MYLABTEST, you can order your test online, choose a convenient lab location, and receive accurate, confidential results from certified laboratories—no doctor’s visit required.
When symptoms don’t match your labs, dig deeper.
