Etiologies of Decreased Radioactive Iodine Uptake Values

• Hypothyroidism, primary or secondary

• Technical error

• Excess organic iodine or inorganic iodine with euthyroidism

• Subacute thyroiditis

• Painless (silent) thyroiditis

• Postpartum transient toxicosis

• Chronic (Hashimotoís) thyroiditis (some patients)

• Amiodarone-induced hyperthyroidism

• Self-administered (factitious) thyroid hormone intake

• Iodine-induced (Jod-Basedow) hyperthyroidism

• Struma ovarii

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