You may be asked not to take this medication before the test. Put on surgical gown. The scanning probe causes no discomfort. Radioactive iodine is taken orally. Iodine has little or no taste.
Discomfort disappears when the test is finished.
Equipment used Oral dose of radioactive iodine. Description of test You or a close relative will be required to sign a consent form after the procedure has been explained to you. You receive a radioactive iodine capsule or liquid. You are scanned 6 and 24 hours later with an external single counting probe to determine the amount of radioactive substance present in your thyroid gland. Lie absolutely still while you are being scanned.