Determination of Parathyroid Function by Fluorescence With Indocyanine Green (ICG) After Total Thyroidectomy

Inclusion Criteria: * Patients who are going to undergo total thyroidectomy, with or without cervical lymph node dissection. * Visualization of 2 or more parathyroid glands during the surgical act. * Normal renal and hepatic functions. * Absence of a history of hypersensitivity reactions to iodine or indocyanine green. * Able to understand the nature and protocol of the study and its procedures * Willingness to participate with the subsequent signing of informed consent. Exclusion Criteria: * Age \<18 years * Hepatic or renal insufficiency * Hypersensitivity to iodine or to indocyanine green. * Pregnancy or lactation * Inability to understand the nature and procedures of the study. * Patients with known preoperative hyperparathyroidism.