TG and differentiated thyroid carcinoma: The management of patients with differentiated thyroid carcinoma (DTC) treated with thyroidectomy and 131I ablation and who during follow-up develop progressive elevation of serum Thyroglobulin (TG), is the administration of 5 milliCuries (mCi) of 131I to obtain an exploratory diagnostic whole-body scintigraphy scan (DWBS), CT (computed tomography), or MRI (magnetic resonance image), and even a 18FDG PET-CT or continued follow up of thyroglobulin levels.