A stress test is a diagnostic test that evaluates heart function and is helpful in detecting coronary artery disease.
There are two types of stress tests:
A stress test may include nuclear imaging, which involves taking two sets of pictures of your heart—one set taken at rest prior to exercising or the administration of a pharmacological agent such as Lexiscan, and the other set of pictures taken afterwards.
Nuclear stress testing helps your physician determine areas of your heart that are healthy and functioning normally, as well as areas of your heart that are not functioning properly. This requires injecting you with a small amount of radioactive substance through an IV. Images of your heart are then taken using a special camera that can identify the energy rays emitted from the radioactive substance within your body.