Triiodothyronine (T3) is one of two major hormones produced by the thyroid gland. The other major thyroid hormone is called thyroxine (T4). Together, these hormones help control the rate at which the body uses energy.
A free T3 or total T3 test may be ordered when someone has an abnormal TSH test result. It may be ordered as part of the investigative workup when a person has symptoms suggesting hyperthyroidism, especially if the free T4 level is not elevated.
Fasting Required: No
CPT Code: 84481
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