Euthyroid Range Reevaluation for Radioactive Iodine Uptake Test

Abstract

A new radioactive iodine uptake euthyroid range with ¹³¹I was obtained at our institution. The thyroid status of 150 patients seen at this institution for RAIU tests was determined utilizing thyroid hormone levels. A mean and standard deviation (s.d.) of the RAIU was calculated on the 57 patients with normal hormone levels. Two s.ds. about the mean yielded a range of 3.0–37.4%. We established a new normal range of 10–35% with the previous normal range being 10–30%.