Glossary
TSH (thyroid-stimulating hormone)
The pituitary hormone used as the main blood test for thyroid function.
TSH (thyroid-stimulating hormone) is released by the pituitary gland to tell the thyroid how much hormone to make. It's the primary screening blood test for thyroid function: a high TSH usually signals an underactive thyroid — the body shouting for more hormone — as in Hashimoto's. It's the number most often tracked to fine-tune thyroid medication.
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