Understanding Lab Tests for Iodine-Induced Hyperthyroidism
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Iodine-induced hyperthyroidism is a condition where excessive iodine intake triggers overactivity of the thyroid gland, particularly in individuals with pre-existing thyroid conditions or iodine deficiency. While thyroid function tests confirm hyperthyroidism, specific testing is needed to identify iodine as the underlying cause.
Recommended Test
Iodine, 24-Hour Urine
This test measures the amount of iodine excreted in urine over a 24-hour period, providing an accurate assessment of recent iodine intake. High levels of iodine in the urine may indicate excessive iodine consumption, which can trigger hyperthyroidism, especially in individuals with pre-existing thyroid disease or iodine deficiency.
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Why Test for Iodine-Induced Hyperthyroidism
Determining whether hyperthyroidism is caused by excess iodine is crucial for proper treatment. Unlike other forms of hyperthyroidism, iodine-induced cases often resolve when the iodine source is removed. Testing helps distinguish this condition from other causes of thyroid overactivity and guides appropriate management.
Understanding Your Results
Elevated urine iodine levels, when combined with clinical symptoms and thyroid function tests showing hyperthyroidism, can help confirm iodine-induced hyperthyroidism. Your healthcare provider will interpret these results alongside other tests and your medical history to determine the most appropriate treatment approach.
Important Considerations
The information here is for educational purposes only and is not a substitute for professional medical advice. Always consult with a healthcare provider for diagnosis and treatment.
