A diagram of the thyroid gland with a text bubble saying what is thyroid hormone conversion?

Normal Thyroid Physiology When we refer to ‘thyroid hormones’ we are talking about T3 and T4. They are the ones the thyroid gland secretes. T4 is more stable in the blood and better for transport around the body; T3 is more biologically active. Of the thyroid hormones produced, 85-90% is T4 and 10-15% is T3.…

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doctor confused by thyroid blood work

Normal Lab Testing Thyroid Function Tests (TFTs) are among the most commonly requested lab investigations. For most of the population, interpreting the lab work is fairly straightforward when we look at a combination of TSH, T4 and perhaps T3. Learn more about the routine lab work here. For a quick review of Basic Thyroid Anatomy…

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