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Triiodothyronine ( T3 )

Also known as: Total T3; Free T3; FT3
Formal name: Triiodothyronine

Why should I do it?
To help diagnose hyperthyroidism

When should I do it?
When a person has an abnormal TSH or T4 result or has symptoms of hyperthyroidism

What Kind of Sample is Needed?
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.