What are radiotracers, exactly, and are they dangerous?
Radiotracers, also commonly termed radiopharmaceuticals, radionuclides or radioisotopes, are low-level radioactive materials which emit radiation or gamma rays which can be imaged with specialized equipment known as a gamma camera. These agents are injected into the body so that a nuclear scanner or camera can take pictures. Sestamibi, Tetrofosmin and thallium are radiotracers commonly used in nuclear tests of the heart. Performed by qualified professionals, tests with radiotracers are safe and effective. The dosages used in nuclear cardiology are very small and well within the limits of safety as determined by NRC (Nuclear Regulatory Commission), the agency which monitors the use of radioisotopes in medical practice. Pregnant women should not have a nuclear test because potential effects on the unborn fetus have not been conclusively determined. If you are pregnant or think you may be pregnant, you should let your doctor know about this before a test is done.
