This paper has questioned Swedish doctors as to their prescription of thyroid hormones for hypothyroidism. It's interesting that despite guidelines 50% of doctors prescribe T3 in combination where they think it necessary. This contrasts sharply with the UK acquiescence in refusing T3 treatment. It's downloadable and an interesting summary of Swedish practice. Not all countries are as blinded to guidance supporting T4 only.
Front. Endocrinol., 06 December 2021 | doi.org/10.3389/fendo.2021....
Use of Thyroid Hormones in Hypothyroid and Euthyroid Patients: A 2020 THESIS Questionnaire Survey of Members of the Swedish Endocrine Society
Tereza Planck, Mikael Lantz, Petros Perros, Enrico Papini, Roberto Attanasio, Endre V. Nagy and Laszlo Hegedüs