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I do not understand why so many practitioners do not order a reverse-T3 (RT3) when ordering a thyroid panel. I consistently order RT3 to screen for additional “thyroid resistance”, “T3 resistance”, and inflammation. RT3 is an inactive form of T3, and T3 is the workhorse hormone of the thyroid. A patient who has an elevated RT3 may experience symptoms varying from fatigue, hair loss, anxiety, and palpitations among others. Since these symptoms are non-specific and can also fit with many other conditions, it is important to test RT3 to assist with a potential diagnosis. Additionally, I have seen patients who have a normal thyroid panel with a high RT3! In summary, a basic thyroid panel will exclude a substantial amount of information and potentially lead to an incorrect diagnosis and treatment. Do not be afraid to ask for a RT3 lab test!

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