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What are T3 (liothyronine) & t4?

5 doctors weighed in
Dr. Susan Wingo
Internal Medicine - Endocrinology
4 doctors agree

In brief: Thyroid hormones.

The two most important forms of thyroid hormone are designated T3 (liothyronine) and T4 based on the number of iodine atoms each molecule contains.
T4 is the main form made and released by the thyroid gland. Once inside cells, T4 is converted to t3, (liothyronine) which is the more active form.

In brief: Thyroid hormones.

The two most important forms of thyroid hormone are designated T3 (liothyronine) and T4 based on the number of iodine atoms each molecule contains.
T4 is the main form made and released by the thyroid gland. Once inside cells, T4 is converted to t3, (liothyronine) which is the more active form.
Dr. Susan Wingo
Dr. Susan Wingo
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