Abstract
A 12-year-old preadolescent girl, clinically eumetabolic, was known to have had a small goiter since the age of 7. Protein-bound iodine and radioactive iodine thyroid uptake were in the hyperthyroid range. However, the erythrocyte uptake of I131-labeled T3 was at the euthyroid level. This discrepancy is thought to be the result of increased serum thyroid-binding protein, which probably also maintains the eumetabolic status of the patient. A 12-year-old preadolescent girl, clinically eumetabolic, was known to have had a small goiter since the age of 7. Protein-bound iodine and radioactive iodine thyroid uptake were in the hyperthyroid range. However, the erythrocyte uptake of I131-labeled T3 was at the euthyroid level. This discrepancy is thought to be the result of increased serum thyroid-binding protein, which probably also maintains the eumetabolic status of the patient.
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