Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
FT3
Introduction
Triiodothyronine, C15H12I3NO4, also known as T3, is a thyroid hormone.
This thyroid hormone is similar to thyroxine but with one less iodine atom per molecule. In addition, T3 exhibits greater activity and is produced in smaller quantity.
It is the most powerful thyroid hormone, and affects almost every process in the body, including body temperature, growth, and heart rate.
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]