Vice versa, different clinical guidelines and the Society of Nuclear Medicine and Molecular Imaging Thyroid Carcinoma Appropriate Use Criteria [66] strongly support a patient-based use of [18F]FDG PET/CT, taking into account the histotype, the clinical history, the absolute thyroglobulin value, and the thyroglobulin doubling time [67]. Here, TG is linked to thyroid gland carcinoma.