About Free T4 Levels Test | Thyroid Testing (FT4)

The free thyroxine (T4) blood test is used to help diagnose thyroid disorders or issues, like hypothyroidism and hyperthyroidism. Thyroxine is one of the two.

The Free T4 Levels Test | Thyroid Testing (FT4) is a laboratory test. Your health care provider can explain what it measures and whether it is appropriate for your situation.

Order Free T4 Levels Test | Thyroid Testing (FT4) in Ithaca

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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.