Radioactive Iodine Uptake Test
A radioactive iodine uptake (RAIU) test uses a Reference radioactive tracer Opens New Window and a special probe to measure how much tracer the Reference thyroid gland Opens New Window absorbs from the blood. The radioactive tracer used in this test is iodine. An RAIU test is done to check for thyroid gland problems, such as Reference hyperthyroidism Opens New Window.
The amount of radioactive tracer in the thyroid gland is normal. An RAIU test measures the amount of tracer taken up by the thyroid gland at certain times after the tracer is given. The measured amount of radioactive tracer in the thyroid gland at each one of these times is at normal levels.
The test shows either more or less uptake of tracer than normal in the thyroid gland. The uptake may be even or uneven. If hyperthyroidism is present, abnormal test results may mean certain conditions are present.
|By:||Reference Healthwise Staff||Last Revised: Reference May 31, 2011|
|Medical Review:||Reference E. Gregory Thompson, MD - Internal Medicine
Reference Matthew I. Kim, MD - Endocrinology