What is reverse T3?
Reverse T3 (RT3 or REVT3) is a biologically inactive form of T3. Normally, when the liver converts T4 to T3, it also produces a certain percentage of RT3. When the body is under stress, such as during a serious illness, it tries to prevent many tissues that depend on T3 from being metabolically active by producing more RT3 than T3. This is believed to be a way of conserving energy until the stress is relieved and it causes a syndrome called non-thyroidal illness (NTI). RT3 may also be elevated in hyperthyroidism.
How do you know if you have RT3?
Reverse T3 can be tested by a simple blood test and / or the
presence of low BBT (basal body temperature) taken at 12- 2 pm (during peak metabolic activity during the circadian rhythm)
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