Myocardial perfusion imaging (MPI) is a nuclear medicine procedure that uses special radiotracers (or imaging agents) to trace how fast they are taken up by the heart muscle. This is a non-invasive test that shows how well blood flows through your heart muscle. It can show areas of the heart muscle that aren’t getting enough blood flow and how well the heart muscle is pumping. There are different types of stress tests that may be done. Please confirm the test you are having with your Health Care Professional as they may be done in different locations and have different instructions to prepare for the test