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Basic thyroid function tests

Authoring team

The first-line thyroid investigation in many hospitals is the highly sensitive TSH assay which should have a limit of detection of <0.1 mU/L.

The addition of an assay for free or total thyroid hormone concentration will reduce diagnostic error but at an increased cost.

Note that reference ranges may vary between laboratories.

Reference

  1. Thyroid Function Tests. British Thyroid Foundation, revised 2021

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