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.

Lab Options - Choose One

LabCorp

$79

Quest Diagnostics

$79

LabCorp

$79

Quest Diagnostics

$79

Test Details

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. 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.

1. Purchase Tests

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.

(Note: to preserve lowest possible per test pricing, a single $10.00 lab fee is applied to one or more blood tests. You will not incur any additional charges at the lab.)

2. Visit a Lab

After purchasing your testing you will receive an email with your lab requisition. Bring this form to the laboratory.

NOTE: Be sure to visit the appropriate laboratory!

If you choose LabCorp only visit a Labcorp location.
If you choose Quest Diagnostics only visit a Quest location!

Find Your Lab Location.

No appointment is needed, but making one can minimize your wait time.
Click here for HOURS & APPOINTMENTS

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.)