About Triiodothyronine Hormone T3 Test

This blood test is used to evaluate free and bound T3 (triiodothyronine) in order to help determine abnormal thyroid function & see if there are T3 deficiencies.

The Triiodothyronine Hormone T3 Test is a laboratory test. Your health care provider can explain what it measures and whether it is appropriate for your situation.

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How to prepare

Most lab tests require a blood or other sample. Follow any instructions given by your healthcare provider or the testing laboratory. Tell your provider about medications, supplements, or recent illnesses that might affect results.