👉 Electrodiagnosis is a diagnostic test that uses magnetic fields to identify abnormalities in the body. It is used to detect diseases such as cancer, heart disease, and diabetes by measuring the electrical activity of the body's cells, called "electrical currents." The electrodes are placed on different parts of the body, depending on which part of the body shows abnormality. This test can be done through a small needle inserted into the skin or through an incision in the skin.