This podcast features a discussion between Dr Kevin Barrett, a GP in Hertfordshire and Maralyn Druce, a Professor of Endocrine Medicine. Topics include:   * The diagnosis of autoimmune hypothyroidism and how to interpret borderline results * When it is appropriate to screen for thyroid disorders * Prescribing levothyroxine and what to tell our patients * The impact of thyroid disorders on pregnancy * How to deal with queries about liothyronine * The May 2021 MHRA guidance for switching levothyroxine manufacturers