Glossary
Glossary
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- Radioactive iodine uptake test
- During a radioactive iodine uptake test, you swallow a small amount of iodine that contains radioactive particles. This type of radioactive iodine does not damage thyroid tissue. The thyroid will absorb and metabolize the iodine within 24 hours. Special equipment is then used to measure the amount of radioactivity over the thyroid gland. If you have Graves' disease, the amount of iodine in the thyroid will be elevated; if you have a temporary form of hyperthyroidism it will be suppressed. A destructive type of radioactive iodine is used as a treatment for thyroid disorders: it shrinks the gland over a period of weeks or months.
