Radioactive Iodine Therapy of Graves' Disease in Patients Pretreated With Methimazole Without Radioiodine Uptake for Dose Estimation.

Objective: To assess response predictors to radioactive iodine (RAI) therapy without using thyroid uptake for dose estimate in patients pretreated with methimazole.

Methods: Retrospective analysis was performed of patients with Graves' disease treated with RAI doses determined without using uptake studies.

Results: In 242 patients (median age, 41.