Norplant contains a potent progesteron, namely levonorgestrel. It induces iodine excretion in urine and simultaneously stimulates the thyroid function. The objectives of this study were to examine the T3, T4 and TSH concentration of the Norplant acceptors for 3 months. The subjects were 8 acceptors of Norplant taken from an endemic goiter area in Cangkringan, Sleman, Yogyakarta. The results of …