The reverse T3 test has to be done at the same time you do the free T3, and you then measure the ratio between the two by dividing the RT3 into the Free T3. The body produces the benign RT3 naturally to rid itself of excess of T4, but in some cases, such as high or low cortisol, RT3 is produced in excess, which can clog cell receptors from receiving T3. FT3 is usually twenty or more times higher than RT3. NOTE: Reverse T3 is analyzed using a specific technique called liquid chromatography/tandem mass spectrometry (LC/MS-MS). There's a special place in the U.S. where these precise machines needed for LC/MS panels run only on two specific days a week. So, sometimes the clock ticks a bit while we wait for samples to return from their initial collection points. Results may take 7 business days.
This panel includes comprehensive testing of the thyroid stimulating hormone (TSH) in addition to free thyroxine (T4) and free triiodothyronine (T3).
To claim, share what your primary goal is:
Sign up to get your discount code
with texts to activate your 20% off
By proceeding, you agree to receive marketing texts. Reply STOP to cancel. Msg & data rates may apply. View Terms.
Check your texts to verify your number. Once verified, start adding tests to cart to use your 20% off!
Enjoy your 20% discount on your next lab test
Claim 20% Off
