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Ideal for patients that have symptoms of hypothyroidism but have adequate T4 and T3 levels. Reverse T3 (rT3) is an inactive hormone, produced as a by product of T4-T3 conversion. When produced in excess this can trigger a negative feedback of the pituitary and hypothalamus with an eventual decline in thyroid hormone production. Blood Test for Reverse Triidothyronine (T3). Serum or Whole blood centrifuged in a SSTP tube
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