Enhanced Sensitivity in Free Thyroxine Measurement Using Equilibrium Dialysis and LC–MS/MS Coupled with Offline Anion-Exchange Solid-Phase Extraction. Journal of Mass Spectrometry and Advances in the Clinical Lab, [S. l.], v. 39, n. 1, 2026. DOI: 10.21627/v8rdvz16. Disponível em: https://rel.journals.sup.org/index.php/jmsacl/article/view/125. Acesso em: 10 nov. 2026.