There term hypothyroidism is based on an elevated TSH (thyroid stimulating hormone) blood test.
T4 (also called thyroxine) is a type of thyroid hormone created
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From the physiologic standpoint, the thyroid gland is one of the most sensitive organs in the body - it's shaped like a butterfly (a delicate being itself) and sits front and center in the neck- with very little protection. In essence, it's our "canary in a coal mine".
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