Synonyms: Reverse Tri-iodothyronine; T3, Reverse

NOTICE: This is a component for the Comprehensive Thyroid Panel which may be more appealing than ordering this test alone.

Why It Is Done

Useful in evaluating thyroid function and metabolism. Evaluate euthyroid patients with low T3 concentrations.

Test Overview

Reverse T3 has minimal physiological activity. T3 concentrations are elevated in acute or chronic diseases due to changes in rates of conversion of T4 to T3 and reverse T3. Reverse T3 levels are elevated at birth and decline to normal levels by the first week of life.

How To Prepare

No special preparation required