Free T4

What does "Free T4" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.

Explanation

Free T4 is a term used in medicine to refer to a specific hormone in the body called thyroxine. This hormone is produced by the thyroid, a small gland located in the neck. The "free" in Free T4 means that the hormone is not attached to any proteins in the blood, so it's available for your body to use. Doctors often measure the level of Free T4 to check how well your thyroid is working.

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