What is radioactive iodine imaging?

Also known as: radioactive iodine uptake test, RAIU test.

Radioactive iodine imaging is a medical test that helps your pediatrician diagnose how well your child’s thyroid gland functions. It uses a short acting dose of radioactive iodine to determine how much the thyroid can take in over a certain period of time. If the thyroid gland takes in too much or too little iodine, it could be indicative of a medical problem.

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Reviewed by: Jack Wolfsdorf, MD, FAAP

This page was last updated on: 1/29/2019 3:21:13 PM