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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Vials of blood held in a gloved hand with text bubble saying is TSH testing enough?

In ‘ideal’ thyroid physiology, a patient’s symptoms would be reflected in their blood work. As doctors, we learn low TSH is associated with hyperthyroidism and high TSH is associated with hypothyroidism. For a full recap on normal thyroid physiology, click here. Usually, thyroid lab test results match the symptoms. Ideal Situations Thyroid Stimulating Hormone (TSH)…

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