October 2023: In the section on investigating suspected thyroid dysfunction, we added a new recommendation on the potential for biotin to interfere with the results of thyroid function tests. See the surveillance review for more information. We also updated the link to NHS England's advice on prescribing liothyronine.
Minor changes since publication
October 2021: We added a link to NICE's guideline on shared decision making in recommendations 1.1.1 and 1.6.8.
February 2020: We added a link to advice on prescribing liothyronine from NHS England's specialist pharmacy service to the rationale section on managing primary hypothyroidism. This link was previously in a footnote.