Reverse T3 Lab Test

SKU
reverse-t3
$65.12

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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.

The reverse T3 (rT3) 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 the 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.

 The rT3 level tends to follow the T4 level: low in hypothyroidism and high in hyperthyroidism

· Increased levels of rT3 have been observed in starvation, anorexia nervosa, severe trauma and hemorrhagic shock, hepatic dysfunction, postoperative states, severe infection, and in burn patients (i.e., "sick euthyroid" syndrome)

· This appears to be the result of switchover in deiodination functions with the conversion of T4 to rT3 being favored over the production of T3

· The Journal of Clinical Endocrinology & Metabolism states that “the T3/rT3 ratio is the most useful marker for tissue hypothyroidism and as a marker of diminished cellular functioning.

 

NOTE: If you are taking biotin, please stop it 72 hours before the blood draw since it may interfere with hormone blood tests.

 


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