Fasting overnight is a usual requirement. Remove jewelry, dentures, or other metals, because they may interfere with the image. The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. The iodine mixture may cause slight nausea when you take it. Some patients find remaining still during the test uncomfortable.
All radiation has possible side effects.
There is a very small amount of radiation in the iodine ingested during this test, but women who are nursing or pregnant should discuss the risks to the fetus or infant with their health care providers before taking this test. The concerns regarding radiation side effects are taken into consideration when the test is ordered, but the benefits of taking the test usually far outweigh the risks. It appears a uniform gray on the computer. If part of the thyroid appears lighter, it may indicate there is possible thyroid dysfunction.