Id like to test for T3 without any medication in my system. How long would I have to refrain from taking the tertroxin before its out of my system?
A. Tertroxin (liothyronine (T3)) has a half life of about 8 hours. This means that for any given dose, 8 hours later half of it has been used up. 8 hours later, half of the remainder would have been used; and so on. After 24 hours there is 1/2 x 1/2 x 1/2 = 1/8 of the original dose left; so by then it is hardly worth talking about. (In two days there is only 1/64 left which is nothing really.) Certainly, for either urine or blood test, the dose should be stopped the previous day.
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