The sensitivity, specificity, positive predictive value and negative predictive value of unstimulated (normal or low TSH ) serum Tg in assessing completeness of thyroidectomy (< 0.5 ng/ml) have been reported to be 70%, 100%, 100% and 92% respectively6. Obtaining a basal unstimulated serum Tg level post thyroidectomy not only determines the completeness of the total thyroidectomy7, but also provides a basal level for future comparison during long-term surveillance. The high negative predictive value allows for the identification of patients less likely to have disease recurrence and provide less aggressive and more cost effective management strategies3.