From a practical perspective, routine use of ultrasound in the immediate post-operative period (<4 months after initial surgery) is not necessary in low to intermediate risk patients that had appropriate pre-operative imaging and evaluations, complete resection of thyroid gland and thyroid cancer by an experienced thyroid surgeon, a normal post-operative physical examination and non-stimulated serum thyroglobulin < 5 ng/mL. Here, TG is linked to thyroid gland carcinoma.