T3

Also known as: Total T3; Free T3

Formal name: Triiodothyronine

Related tests: TSH; T4; Thyroid Antibodies

At a Glance

Why Get Tested?

To help diagnose hyperthyroidism

When to Get Tested?

If a patient has an abnormal TSH or T4 result or has symptoms of hyperthyroidism

Sample Required?

A blood sample taken from a vein in the arm

Test Preparation Needed?

None needed; however, certain medications can interfere with the T3 test, so tell your doctor about any drugs that you are taking.

This article was last reviewed on January 26, 2008. | This page was last modified on November 14, 2009.

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