Thyroid Function (TSH)

Thyroid-stimulating hormone (TSH) is the pituitary gland’s instruction to the thyroid, and measuring it is the standard first test of thyroid function. It works like a thermostat: when thyroid hormone runs low — as it can when iodine is scarce — the body pushes TSH up to drive the gland harder, so a raised TSH often signals an underactive thyroid. Because the thyroid is built using iodine, thyroid markers are among the few that tie directly back to a single nutrient.

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