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Effect of postoperative 131I treatment on thyroglobulin measurements in the follow-up of patients with thyroid cancer.

Correlation of serum thyroglobulin (Tg) levels with recurrent cancer was performed in 200 patients who had undergone a subtotal thyroidectomy for well-differentiated thyroid carcinoma. Patients were divided into three groups: (1) those not treated postoperatively with radioactive iodine, (2) those treated with low dose (30 mCi) radioactive iodine, and (3) those treated with high dose (50-250 mCi) radioactive iodine. Tg levels proved to be reliable in detecting recurrent thyroid cancer regardless of the dose of radioactive iodine given postoperatively. These results reinforce the recommendation of using the Tg assay as the primary method of following these patients postoperatively, even when there was less than a total thyroidectomy and ablation with radioactive iodine.