Total thyroidectomy is the standard surgical treatment for differentiated thyroid carcinoma followed by radioactive iodine131ablation.The purpose of the study is to evaluate 99mTc-MIBI scan with and without hormonal withdrawal independently and in conjugation with 131I scan as well as Tg level. 131I WBS is more sensitive than 99mTc-MIBI. 99mTc-MIBI scan after thyroxine withdrawal has the same results like without thyroxine withdrawal with no added value so no need for stoppage of suppression therapy before 99mTc-MIBI scan.The addition of serum Tg level to the 99mTc-MIBI WBS increases the specificity.